Table 1 The difference of demographic characteristics between analysis data and missing data
Characteristic | Included (n = 1042) | Excluded (n = 93) | χ2/t | P-value |
|---|---|---|---|---|
Age | 18.81 ± 1.18 | 18.60 ± 0.80 | 1.52 | 0.09 |
Gender | Â | Â | 0.01 | 0.93 |
Male | 397(38.1) | 35(37.6) | Â | Â |
Female | 645(61.9) | 58(62.4) | Â | Â |
Living place | Â | Â | Â | Â |
Rural | 583(56.0) | 50(53.8) | 0.17 | 0.68 |
Urban | 459(44.0) | 43(46.2) | Â | Â |
Any siblings | Â | Â | Â | Â |
Yes | 242(23.2) | 26(28.0) | 1.60 | 0.30 |
No | 800(76.8) | 67(72.0) | Â | Â |
Self-reported family economy | Â | Â | Â | |
Low | 254(24.4) | 19(19.4) | 5.78 | 0.06 |
Medium | 736(70.6) | 64(68.8) | Â | Â |
high | 52(5.0) | 10(11.8) | Â | Â |
Self-reported academic performance | Â | 2.60 | 0.27 | |
Low | 220(21.1) | 19(20.4) | Â | Â |
Medium | 644(61.8) | 52(55.9) | Â | Â |
high | 178(17.1) | 22(23.7) | Â | Â |
Father’s education level |  |  | 3.79 | 0.15 |
Primary school and below | 239(22.9) | 18(19.4) | Â | Â |
Middle school | 500(48.0) | 39(41.9) | Â | Â |
Senior high school and above | 303(29.1) | 36(38.7) | Â | Â |
Mother’s education level |  |  | 0.77 | 0.68 |
Primary school and below | 457(43.9) | 40(43.0) | Â | Â |
Middle school | 366(35.1) | 30(32.3) | Â | Â |
Senior high school and above | 219(21.0) | 23(24.7) | Â | Â |