Table 4 Coefficients (95% confidence intervals for β) from the stepwise linear regression model assessing the influencing factors of premarital sexual permissiveness, grouped by sex

Sex (ref: male)

6.18 (4.56 ~ 7.80)^**

–

–

Grade (ref: middle school)

−2.49 (− 3.99 ~ − 0.98)^*

−5.57 (−8.28 ~ − 2.87)^**

–

One-child family (ref: no)

− 3.95 (−6.02 ~ − 1.88)^**

−4.55 (− 7.93 ~ − 1.18)^*

− 3.56 (− 6.06 ~ − 1.05)^*

Left-behind student (ref: no)

1.47 (0.05 ~ 2.89)^*

–

2.87 (1.27 ~ 4.47)^**

Gender role attitudes

0.17 (0.10 ~ 0.24)^**

0.19 (0.07 ~ 0.31)^*

0.10 (0.02 ~ 0.18)^*

History of exposure to pornographic content on electronic media (ref: no)

−6.88 (− 8.90 ~ − 4.86)^**

− 6.94 (−9.90 ~ − 3.99)^**

–

History of dating or falling in love with somebody (ref: no)

− 4.66 (− 6.24 ~ − 3.07)^**

−5.40 (− 8.18 ~ − 2.61)^**

−3.87 (− 5.59 ~ − 2.15)^**

Friends’ approval of premarital sex (ref: no)

−4.51 (− 6.28 ~ − 2.74)^**

− 5.30 (− 8.97 ~ − 1.63)*

−3.43 (− 5.20 ~ − 1.65)^**

Parents’ approval of premarital sex (ref: no)

− 3.06 (− 4.70 ~ − 1.42)^**

−4.77 (− 8.12 ~ − 1.42)^*

−1.81 (− 3.48 ~ − 0.14)^*

CSA (ref: no)

−2.84 (− 4.81 ~ − 0.88)^*

− 3.76 (− 7.00 ~ − 0.52)^*

− 2.79 (− 5.18 ~ − 0.40)^*

Constant

72.98 (67.46 ~ 78.51)

83.53 (74.52 ~ 92.55)

85.61 (79.08 ~ 92.13)