|   城乡  |       城镇(n = 583)  |       22.32 ± 6.18  |       16.61 ± 4.98  |       20.15 ± 4.46  |       15.61 ± 2.44  |       14.15 ± 3.34  |       21.28 ± 2.82  |       95.97 ± 12.87  |    
|   农村(n = 13)  |       21.00 ± 5.79  |       16.46 ± 6.12  |       21.23 ± 5.40  |       15.46 ± 2.99  |       14.46 ± 4.07  |       20.69 ± 3.25  |       94.85 ± 15.75  |    |
|   
  |       t  |       0.764  |       0.105  |       −0.860  |       0.217  |       −0.334  |       0.743  |       0.311  |    
|   独生 子女  |       是(n = 453)  |       22.53 ± 6.21  |       16.71 ± 5.04  |       20.17 ± 4.56  |       15.66 ± 2.48  |       14.17 ± 3.34  |       21.29 ± 2.86  |       96.36 ± 12.98  |    
|   否(n = 143)  |       21.55 ± 6.00  |       16.28 ± 4.88  |       20.20 ± 4.23  |       15.43 ± 2.33  |       14.11 ± 3.42  |       21.22 ± 2.75  |       94.66 ± 12.71  |    |
|   
  |       t  |       1.666  |       0.893  |       −0.070  |       1.439  |       0.174  |       0.258  |       1.365  |    
|   父亲 文化  |       高(n = 428)  |       22.22 ± 5.98  |       16.67 ± 5.08  |       20.01 ± 4.59  |       15.55 ± 2.41  |       14.06 ± 3.39  |       21.24 ± 2.87  |       96.69 ± 12.85  |    
|   低(n = 32)  |       21.50 ± 5.61  |       16.94 ± 4.99  |       20.22 ± 4.08  |       15.59 ± 2.37  |       14.41 ± 3.39  |       21.19 ± 2.13  |       95.44 ± 12.10  |    |
|   
  |       t  |       0.655  |       −0.284  |       −0.251  |       −0.107  |       −0.552  |       0.107  |       0.106  |    
|   母亲 文化  |       高(n = 365)  |       22.18 ± 6.21  |       16.48 ± 5.00  |       20.01 ± 4.57  |       15.63 ± 2.24  |       14.06 ± 3.36  |       21.34 ± 2.72  |       95.64 ± 12.94  |    
|   低(n = 49)  |       22.59 ± 6.58  |       18.12 ± 5.27  |       20.57 ± 4.33  |       16.18 ± 2.55  |       14.15 ± 3.03  |       21.57 ± 2.60  |       99.04 ± 13.16  |    |
|   
  |       t  |       −0.435  |       −2.141**  |       −0.811  |       −1.603  |       −1.293  |       −0.563  |       −1.724  |