Table 5.
Logistic regression of the influencing factors of social phobia between the only child and child with siblings (subgroup analysis). aMcFadden's R2 = 0.312. GVIF for all variables is less than 1.57. bMcFadden's R2 = 0.285. GVIF for all variables is less than 1.61. – for variables without statistical significance that were removed by stepwise regression. / for not applicable. OR odds ratio, CI confidence interval, BMI body mass index, GPA grade point average, USD United States dollar.
| Factor | The only child (n = 873)a | Child with siblings (n = 986)b | ||
|---|---|---|---|---|
| OR (95% CI) | P value | OR (95% CI) | P value | |
| Demographic information | ||||
| Gender (female vs male) | – | – | 0.42 (0.30–0.59) | < 0.001 |
| Nation (ethnic minorities vs ethnic Han) | 2.05 (0.95–4.46) | 0.069 | – | – |
| Economic zone (vs Eastern) | ||||
| Central | 0.80 (0.51–1.26) | 0.338 | – | – |
| Western | 0.77 (0.48–1.24) | 0.284 | – | – |
| Northeast | 0.34 (0.17–0.69) | 0.003 | – | – |
| Region (rural vs urban) | – | – | 0.70 (0.51–0.98) | 0.037 |
| College type (985 vs non-985) | – | – | 0.76 (0.53–1.10) | 0.144 |
| GPA ranking (vs top 20%) | ||||
| 20–40% | – | – | 2.03 (1.27–3.24) | 0.003 |
| 40–60% | – | – | 1.87 (1.14–3.08) | 0.013 |
| 60–80% | – | – | 1.47 (0.74–2.91) | 0.275 |
| After 80% | – | – | 2.39 (0.91–6.32) | 0.078 |
| BMI (vs normal) | ||||
| Overweight | – | – | 0.53 (0.30–0.93) | 0.028 |
| Obesity | – | – | 1.68 (0.62–4.58) | 0.308 |
| Underweight | – | – | 1.66 (1.13–2.44) | 0.010 |
| Exercise frequency (vs < once a week) | ||||
| 1–2 times a week | 0.99 (0.62–1.57) | 0.954 | – | – |
| ≥ 3 times a week | 0.66 (0.40–1.11) | 0.120 | – | – |
| Social relations | ||||
| Being in love now (yes vs no) | – | – | 0.78 (0.57–1.08) | 0.141 |
| Never participate in student organizations (vs ever) | – | – | 1.32 (0.92–1.89) | 0.127 |
| Childhood bullying experience (vs never) | ||||
| Seldom | 1.33 (0.89–1.99) | 0.165 | 1.13 (0.79–1.63) | 0.504 |
| Sometimes | 2.32 (1.29–4.18) | 0.005 | 3.63 (2.06–6.40) | < 0.001 |
| Often | 2.43 (0.70–8.40) | 0.161 | 4.57 (1.11–18.74) | 0.035 |
| Family information | ||||
| Monthly household income per capita (vs < 309 USD) | ||||
| 309–772 USD | 2.22 (0.85–5.82) | 0.104 | – | – |
| 772–1543 USD | 1.61 (0.63–4.15) | 0.322 | – | – |
| > 1543 USD | 1.19 (0.46–3.11) | 0.716 | – | – |
| Closeness of family relationship (vs close) | ||||
| General | – | – | 1.73 (1.17–2.54) | 0.006 |
| Alienated | – | – | 1.12 (0.39–3.23) | 0.830 |
| Number of siblings (vs 1) | ||||
| 2 | / | / | 1.72 (1.19–2.48) | 0.004 |
| ≥ 3 | / | / | 0.85 (0.43–1.70) | 0.654 |
| Childhood adversity experience (vs never) | ||||
| Seldom | 1.52 (1.00–2.31) | 0.049 | 1.67 (1.15–2.45) | 0.008 |
| Sometimes | 5.09 (2.95–8.78) | < 0.001 | 1.46 (0.89–2.39) | 0.137 |
| Often | 12.23 (3.71–40.32) | < 0.001 | 11.63 (2.51–53.90) | 0.002 |
| Self-evaluation | ||||
| Mobile phone dependence (vs no) | ||||
| General | 1.49 (0.95–2.35) | 0.086 | 2.97 (1.96–4.50) | < 0.001 |
| Yes | 5.19 (3.15–8.54) | < 0.001 | 5.01 (3.09–8.14) | < 0.001 |
| Appearance satisfaction (vs not very satisfied) | ||||
| Moderately satisfied | 1.02 (0.48–2.15) | 0.962 | 0.86 (0.54–1.36) | 0.523 |
| Quite satisfied | 0.34 (0.16–0.71) | 0.004 | 0.57 (0.34–0.96) | 0.035 |
| Mental health self-assessment (vs not very healthy) | ||||
| Moderately healthy | – | – | 0.54 (0.22–1.34) | 0.182 |
| Quite healthy | – | – | 0.26 (0.11–0.66) | 0.004 |
| Degree of trust in strangers (vs not very trust) | ||||
| Moderately trust | – | – | 0.76 (0.53–1.08) | 0.125 |
| Quite trust | – | – | 1.18 (0.75–1.87) | 0.475 |