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Table 1 Sex, age and grade distributions of the selected and examined population

From: Prevalence and causes of visual impairment and rate of wearing spectacles in schools for children of migrant workers in Shanghai, China

  

Examined population

Not examined population

Enumerated population

Pvalue

(N, %)

(N, %)

(N, %)

Sex

Male

5508 (57.91)

102 (63.35)

5610 (58.00)

0.1649

Female

4004 (42.09)

59 (36.65)

4063 (42.00)

Age (y)

7–8

2985 (31.38)*

40 (24.84)

3025 (31.27)

0.0261

9-–10

3495 (36.74)

54 (33.54)

3549 (36.69)

11–12

3032 (31.88)

67 (41.61)

3099 (32.04)

Grade

1

2274 (23.91)

23 (14.29)

1857 (19.20)

0.0108

2

2004 (21.07)

41 (25.47)

1722 (17.80)

3

1721 (18.09)

31 (19.25)

3025 (31.27)

4

1831 (19.25)

26 (16.15)

3549 (36.69)

5

1682 (17.68)

40 (24.84)

3099 (32.04)

All

9512 (100.00)

161 (100.00)

9673 (100.00)

 
  1. *Five 6-year-old children were grouped with the 7–8-year olds.
  2. Ten 13-year-old children were grouped with the 11–12-year olds.