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. 2026 Apr 25;14:836. doi: 10.1186/s40359-026-04604-4

Table 2.

Mediation analysis (N = 1,176)

Variable Equation 1 (Outcome: shyness) Equation 2 (Outcome: PSU)
β z 95% CI β z 95% CI
Gender 0.057 1.867 [−0.005, 0.118] −0.082** −2.691 [−0.142, −0.021]
Grade −0.047 −1.526 [−0.108, 0.013] 0.172** 5.937 [0.117, 0.229]
PEL 0.104** 3.392 [0.045, 0.165] 0.062* 2.209 [0.005, 0.106]
PPC 0.304** 8.214 [0.231, 0.378] 0.249** 6.206 [0.171, 0.327]
shyness 0.291** 7.539 [0.216, 0.368]
R2 0.108 0.228

PPC parental psychological control, PSU problematic smartphone use, PEL parental educational level; Bootstrap sample size = 5000. CI Confidence interval

*p < 0.05(two-tailed). **p < 0.01(two-tailed). All βs are standardized coefficients