Table 1. Baseline data.
| Baseline data | RG | CG | t or χ2 | P |
|---|---|---|---|---|
| Age | 7.53±2.14 | 7.54±2.38 | 0.019 | 0.985 |
| Gender | 0.275 | 0.600 | ||
| Boy/girl | 24/14 | 20/15 | ||
| Childbirth | 0.308 | 0.579 | ||
| Natural childbirth/caesarean section | 22/16 | 18/17 | ||
| Only child | 0.145 | 0.704 | ||
| Yes/no | 29/9 | 28/7 | ||
| Family history of illness | 0.015 | 0.902 | ||
| Yes/no | 4/34 | 4/34 | ||
| Sleep performance | 0.085 | 0.959 | ||
| Snoring/open mouth breathing/both | 7/5/26 | 6/4/25 | ||
| Living environment | 0.226 | 0.635 | ||
| Town/rural | 29/9 | 25/10 | ||
| Nationality | 0.893 | 0.345 | ||
| Han/minority | 35/3 | 34/1 |
RG, research group; CG, control group.