To explore the features of sleep quality and its relationship with perceived stress and occupational stress in military personnel serving in high-altitude regions.

Cross-sectional study design was adopted in this study. In February 2023, self-designed demographic data questionnaire, Pittsburgh sleep quality index (PSQI), perceived stress scale (PSS-10) and job content questionnaire (JCQ) were applied to survey 3 784 soldiers from a unit stationing in plateau subjected by cluster sampling.

The total score of PSQI was 5.37±2.78 in the participants, and the total score and the scores of each dimension of PSQI were significantly higher than the national norms for Chinese (P < 0.001). There were significant differences in PSQI scores among different age, length of military service, nationality, length of stationing in plateau, education level and family structure (P < 0.001). The low perceived stress group had significantly lower PSQI scores than the high perceived stress group (t=-12.108, P < 0.001). Regulatory effect analysis showed that the length of stationing in plateau, work autonomy, work psychological requirements, and social support in the work environment could modulate the relationship between perceived stress and sleep quality (t=8.326, -3.788, -2.145, -6.656, P < 0.05), and explained 14.6%, 7.6%, 7.0% and 7.9% of the variance of sleep quality, respectively.

The military personnel serving in high-altitude regions have a poor sleep quality. Age, time of military service, time of stationing in plateau, nationality, family structure, education level, perceived stress, and occupational stress are important factors affecting their sleep quality. The length of stationing in plateau time and occupational stress, can modulate the relationship between perceived stress and sleep quality.

To explore the effects of military operation types on the mental health of Chinese veterans and the mediating role of psychological quality based on a dual-factor model of mental health.

Cross-sectional study design was adopted in this study. Self-designed demographic information questionnaire, patient health questionnaire depression module-9 item (PHQ-9), general anxiety disorder-7(GAD-7), satisfaction with life scale and psychological quality questionnaire were used to survey on 3 027 Chinese veterans.

① Compared to the one-factor model and the two-factor models with other indicators, the dual-factor model of mental health, with anxiety symptoms as a negative indicator and life satisfaction as a positive indicator, fitted better (Chi-square/df=8.927, GFI=0.974, AGFI=0.962, RMSEA=0.051, NNFI=0.985, IFI=0.988, CFI=0.988).②Taking the subjects who did not participate in war/non-war military operations as the reference, psychological quality showed significant relatively mediating effects between war and life satisfaction, and between war and anxiety symptoms (P < 0.05), while no such significances were observed in the corresponding ones for non-war military operations.③ War could decrease veterans'life satisfaction through full mediation of cognitive, adaptive and personality dimensions of psychological quality, and increase anxiety symptoms through partial mediation of the personality dimension of psychological quality.

The dual-factor model of mental health is applicable to Chinese veteran population, and psychological quality plays a mediating role between war and mental health.

To explore the characteristics and influencing factors of family resilience among Chinese PLA Army personnel.

A total of 8 094 military personnel subjected with cluster sampling were surveyed with family resilience scale (FRS) and self-designed questionnaire for basic information on military families. Independent sample t test, one-way analysis of variance and step-up regression analysis were employed to analyze the family resilience.

① The results of demographic variable analysis showed that there were significant differences in family resilience among the personnel with different marital status, from one-child family or not, birth in rural/urban areas, personnel category, age and education level (P < 0.05).② Family factors analysis indicated that different family structure, different family relationships, family rearing styles, recent separation from family members, and frequency of contacting family members had certain effects on family resilience (P < 0.05).③ When family relationship, family rearing styles, frequency of contacting family members, birth place, recent separation from family, personnel category, from one-child family, and education level entered the regression equation, the resilience level of army personnel' families was increased by 8.197 for every 1 unit increase in family relationship, and the level of family resilience was increased by 4.688 for every 1 unit increase in family contact frequency (F=202.168, P < 0.05).

The overall level of family resilience of army personnel is good. The risk factors for family resilience are recent separation from their families for ≥1 year, officers, not from only-children family, and the protective factors are harmonious relationship with their families, democratic family rearing style, contacting with their families weekly, urban birth, and bachelor degree or above.

To explore the relevant relationship and specificity between the implicit and explicit loyalty of military cadets in order to provide a theoretical basis and objective indicators for a more comprehensive and objective assessment for individual loyalty.

E-Prime 2.0, a classic implicit association paradigm was employed to construct an implicit association loyalty test for 64 military cadets. Simultaneously, an explicit loyalty measurement was conducted using the Chinese Military Personnel Loyalty Scale.

① Significant implicit effect was observed in the loyalty assessment of military cadets, indicating a general tendency to perceive higher levels of personal loyalty and lower levels of loyalty to external entities. ② Explicit loyalty assessment revealed that the participants had the highest loyalty score towards the Party, the Nation, and the People (4.79±0.34), followed by the loyalty score to their profession (4.38±0.53), and the relatively lower loyalty score towards the unit and leaders (4.03±0.83). Among the 3 dimensions of loyalty, the normative loyalty score ranked highest, while continuance loyalty score took lower. ③ There were no correlations among the scores of loyalty to the Party, the Nation, and the People (r=-0.030, P=0.823), to the profession (r=-0.047, P=0.728), to the unit (r=0.050, P=0.710), or to the leaders (r=0.043, P=0.749).

The implicit effect in the loyalty assessment is significant in military cadets, and there is no significant correlation between explicit and implicit loyalty measurements. Thus, we cannot rely solely on explicit measurements to assess their loyalty attitudes.

To develop a Negative Cognitive Processing Bias Scale for Adolescents and examine its reliability and validity, and apply it to explore the status quo of negative cognitive processing bias in adolescents.

Based on Negative Cognitive Processing Bias Questionnaire for Adults, a theoretical model was constructed according to the results of literature analysis and expert interviews, and then a Negative Cognitive Processing Bias Scale suitable for adolescents was developed with reference to the opinions of primary and secondary school teachers. A total of 5 794 adolescents were subjected and randomly allocated into Sample 1 (n=2 897) and Sample 2 (n=2 897). The data in Sample 1 were analyzed by item analysis and exploratory factor analysis, and the data of Sample 2 were analyzed by confirmatory factor analysis. Finally, the overall data of 5 794 participants were used to test the reliability of the scale. Descriptive statistics, independent sample t-test and one-way ANOVA were used to analyze the negative cognitive processing bias of the participants.

① Our developed scale had 14 items and mainly 3 factors, that is, negative attention bias, negative memory bias and negative interpretation bias. ② The 3-factor model was fit for the data well (RMSEA=0.052, SRMR=0.028, CFI=0.957, TLI=0.947). The Cronbach's α coefficient was 0.883, the McDonald's ω coefficient was 0.884, the split half reliability coefficient was 0.849, and the criterion validity with the score of Self-Rating Depression Scale (SDS) was 0.494 (P < 0.01). The dimension scores were positively correlated with total score of the scale (r=0.707~0.941, P < 0.01). ③ The negative cognitive processing bias of adolescents was quite higher, and there were significant difference in demographic variables.

Our developed Negative Cognitive Processing Bias Scale for Adolescents has good validity and reliability, and can be used for measuring negative cognitive processing bias in adolescents.

To develop a depressive interpretation bias questionnaire with Chinese culture based on the similarity rating task（SRT）, and to test its reliability and validity.

After being authorized, the ambiguous paragraphs in cognitive behavior modification errors prospective training items（CBM-I）were translated and screened in the first round, the screened paragraphs combined with the remaining of SRT and the self-written ambiguous paragraphs to form the screening questionnaire of the second round. Fourteen ambiguous paragraphs were selected as the items, and then the ambiguous situation interpretation bias questionnaire was compiled using SRT as the template. The reliability and validity analysis and item analysis were launched after 477 were tested by the questionnaire mentioned before.

A 14-item-formed questionnaire was compiled after 2 rounds of screening, then 5 factors were extracted by exploratory factor analysis, and the cumulative contribution rate was 52.67%. The confirmatory factor analysis showed that the five-factor model fitted well. Cronbach's α was 0.613, and split-half reliability was 0.617; Paired t-test was used to test the content validity, which showed significant difference between the target sentences and the foil sentences（t=-12.90, P<0.01）. The questionnaire had good criterion validity, regarding the center for epidemiologic studies depression scale（CES-D）in Chinese version as criterion, while the total T score was significantly correlated with the total score of the CES-D（r=-0.224, P<0.01）.

The interpretation bias questionnaire with ambiguous scenarios is a applicable measurement of depression interpretation bias in China.

To construct a theoretical model for cognitive domain information transmission（COIT）to promote the establishment of an attack and defense system for COIT, and further to validate it by simulating data in mathematical model.

A hub-susceptible-infected-recovery（HSIR）model was proposed theoretically to conceptualize COIT, and then the model was validated with Runge-Kutta nonlinear integral equation for mathematical simulation.

Standard HSIR model showed when cognitive domain information was transmitted in a large population of 10 000 people, the peak transmission was observed at Day 46 and 7 480 members were covered, with a basic reproduction number of 1.3. Further, when some measures were taken to obstruct COIT at Days 8, 4 and 2, respectively, the number of peak infects people was decreased to 5 822, 4 892 and 4 126, with a peak transmission duration shortened by 92, 62 and 41 d, in order.

Basing on HSIR model, we bring forward a dynamic model of COPT, and primarily construct a defense system of COPI combat.

To explore the relationship between family resilience and mental health in military personnel from the perspective of the dual-factor model of mental health.

A total of 8 094 soldiers were selected as subjects. Family Resilience Scale, Satisfaction with Life Scale (SWLS) and Short-Form version of Depression Anxiety Stress Scales (DASS-21) were applied to investigate the relationship of family resilience with positive indicators of mental health, life satisfaction, negative indicators of mental health, as well as depression, anxiety, and stress.

Ten first-order factors, 2 second-order factors and total scores of family resilience were positively correlated with life satisfaction (r=0.242~0.469, P<0.01), and negatively correlated with DASS-21 (r=-0.333~-0.126, P<0.01). The life satisfaction scores of subjects at different families resilience levels showed a linear downward trend, with significant differences (F=162.153~924.656, P<0.01). The DASS-21 scores of subjects at different families resilience levels displayed a linear upward trend (F=35.783~335.658, P<0.01). The correlation coefficients of family resilience and life satisfaction were greater than the absolute values of the DASS-21 correlation coefficients. Regression analysis showed that family belief and family strength showed significant effects on life satisfaction, and could jointly predict 22% variation of positive mental health. Family strength had a significant influence on the DASS-21 scores, while family belief had no effect on DASS-21 scores, and could predict 11% variation of negative mental health.

There is a correlation between military family resilience and military mental health, and family resilience is the key point to promote military mental health.