| |
Severe deficient
|
Deficient
|
Insufficient
|
Sufficient
|
P value
|
|---|
|
Vitamin D (ng/mL,−x ± s)
|
7.45 ± 2.19
|
15.35 ± 2.87
|
25.04 ± 2.81
|
38.74 ± 10.57
|
< 0.001
|
|
Percentage (%)
|
6.57
|
25.51
|
33.52
|
34.40
| |
|
Male (%)
|
51.20
|
53.07
|
55.42
|
56.34
|
< 0.001
|
|
Age (years,−x ± s)
|
7.54 ± 4.99
|
6.65 ± 3.94
|
4.18 ± 3.38
|
2.09 ± 2.39
|
< 0.001
|
|
Ethnic (Han, %)
|
98.31
|
98.49
|
98.28
|
98.14
|
0.063
|
|
Overweight and obesity (%)
|
18.11
|
11.34
|
8.17
|
4.21
|
< 0.001
|
|
Season (%)
| | | | |
< 0.001
|
|
Spring
|
30.50
|
29.82
|
31.12
|
32.29
| |
|
Summer
|
26.53
|
29.33
|
28.19
|
27.83
| |
|
Autumn
|
16.31
|
17.35
|
18.69
|
18.85
| |
|
Winter
|
26.66
|
23.50
|
22.00
|
21.03
| |
|
Outdoor activity time (%)
| | | | |
< 0.001
|
|
< 30 min/d
|
58.69
|
56.23
|
25.63
|
25.72
| |
|
30–60 min/d
|
23.56
|
22.14
|
38.63
|
34.31
| |
|
> 60 min/d
|
17.75
|
21.63
|
35.74
|
39.97
| |
|
Intervention methods (%)
| | | | |
< 0.001
|
|
No intervention
|
90.31
|
74.10
|
50.16
|
26.18
| |
|
Supplementation intervention
|
7.27
|
17.94
|
35.06
|
46.70
| |
|
Therapeutic intervention
|
2.43
|
7.96
|
14.79
|
27.12
| |
- −x ± s and percentage (%) were used to describe the continuous and categorical variables, respectively; P < 0.05 was regarded as statistically significant
