Table 2.
Comparisons of parental income, living space, birth categories and family history of ORD between cases and controls
| Variables | Cases (n = 1,282),% or median with 95% CI | Controls (n = 2,586),% or median with 95% CI | χ2 | P | |
|---|---|---|---|---|---|
| Parental income (RMB/year)A |
< 20,000 |
11.7 |
10.0 |
7.903 |
0.095 |
| 20,000-50,000 |
25.2 |
25.3 |
|||
| 50,000-100,000 |
34.9 |
38.4 |
|||
| 100,000-20,000 |
19.7 |
19.4 |
|||
| ≥ 200,000 |
8.5 |
6.9 |
|||
| Living space (m2)B |
|
110.3 (107.7, 110.9) |
107.0 (105.4, 108.6) |
/ |
0.202 |
| Aberrant birth categories A |
Preterm SGA |
0.3 |
0.2 |
29.707 |
0.000* |
| Preterm AGA |
3.7 |
2.7 |
|||
| Preterm LGA |
0.8 |
0.3 |
|||
| Full term SGA |
6.5 |
5.1 |
|||
| Full term AGA |
63.4 |
71.6 |
|||
| Full term LGA |
23.9 |
18.9 |
|||
| Post-term SGA |
0.23 |
0.15 |
|||
| Post-term AGA |
0.9 |
0.8 |
|||
| Post-term LGA |
0.23 |
0.19 |
|||
| Immediate family members with history of obesity related disease A |
Father |
42.5 |
30.7 |
52.798 |
0.000* |
| |
Mather |
20.8 |
13.3 |
36.483 |
0.000* |
| |
Paternal grandfather |
42.7 |
38.5 |
6.396 |
0.011* |
| |
Paternal grandmother |
49.8 |
40.5 |
30.261 |
0.000* |
| |
Maternal grandfather |
43.2 |
39.8 |
4.153 |
0.042* |
| Maternal grandmother | 47.7 | 40.8 | 16.466 | 0.000* |
Note. A referred toχ2 test, and B referred to nonparametric Mann–Whitney U test; *P <0.05, statistically significant difference. Parental educational level and career with P>0.1 were not listed in this table due to wide space to occupy.