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Table 1 Sample characteristics

From: Characteristics and risk factors of children with sleep-disordered breathing in Wuxi, China

Characteristic

Total

(n = 3997)

SDB

(n = 534, 13.4%)

NO SDB

(n = 3463, 86.6%)

Group differences

P

Age in years (mean SD)

9.50 ± 3.12

9.00 ± 3.17

9.58 ± 3.11

t = −3.974

0.000*

Male(%)

1906 (47.7)

271 (14.2)

1645 (85.8)

χ2 = 2.318

NS

Height (cm)

median (min-max)

139.00 (120.00–152.00)

135.00 (104.00–150.00)

140.00 (120.00–153.00)

Z = -3.498

0.000*

Weight (kg)

median (min-max)

31.00 (22.00–42.50)

30.00 (21.00–43.00)

32.00 (22.50–43.00)

Z = -2.879

0.004

BMI

median (min-max)

16.64 (14.99–18.84)

16.43 (14.88–19.00)

16.65 (15.00–18.85)

Z = -0.787

NS

Asthma

131

37 (28.2)

94 (71.8)

χ2 = 25.922

0.000*

Eczema

1487

283 (19.0)

1204 (81.0)

χ2 = 65.802

0.000*

Urticaria

475

78 (16.4)

397 (83.6)

χ2 = 4.364

0.044†

Rhinitis

1003

215 (21.4)

788 (78.6)

χ2 = 75.442

0.000*

Sleep duration/night, hours median (min-max)

9.00 (8.08–9.50)

9.00 (8.00–9.50)

9.00 (8.10–9.50)

Z-0.829

NS

Day naps, hours

median (min-max)

0.00 (0.00–1.00)

0.00 (0.00–1.50)

0.00 (0.00–1.00)

Z = -0.787

0.022

Pillow material

3864

520 (13.5)

3344 (86.5)

χ2 = 8.908

NS

 Buckwheat

765 (19.8)

95 (12.4)

670 (87.6)

  

 Silk

153 (4.0)

28 (18.3)

125 (81.7)

  

 Down/ Feather

337 (8.7)

40 (11.9)

297 (88.1)

  

 Sponge

812 (21.0)

118 (14.5)

694 (85.5)

  

 Chemical fiber

616 (15.9)

69 (11.2)

547 (88.8)

  

 Others

1181 (30.6)

170 (14.4)

1011 (85.6)

  

Quilt material

3877

521 (13.4)

3356 (86.6)

χ2 = 9.745

NS

 Cotton

2497 (64.4)

324 (13.0)

2173 (87.0)

  

 Down/ Feather

246 (6.3)

43 (17.5)

203 (82.5)

  

 Silk

851 (21.9)

121 (14.2)

730 (85.8)

  

 Wool

78 (2.0)

6 (7.7)

72 (92.3)

  

 Blanket

29 (0.7)

2 (6.9)

27 (93.1)

  

 Chemical fiber

112 (2.9)

19 (17.0)

93 (83.0)

  

 Others

64 (1.7)

6 (9.4)

58 (90.6)

  

Sleeping position

3997

534 (13.4)

3463

χ2 = 8.007

0.018†

 Supine

1275 (31.9)

166 (13.0)

1109 (87.0)

  

 Lateral

2378 (59.5)

305 (12.8)

2073 (81.2)

  

 Prone

344 (8.6)

63 (18.3)

281 (81.7)

  

Sleep environment

3997

534 (13.4)

3463

χ2 = 5.396

NS

 Shares a bed

1307 (32.7)

198 (15.1)

1109 (84.9)

  

 Shares a bedroom

631 (15.8)

80 (12.7)

551 (87.3)

  

 Sleep alone

2059 (51.5)

256 (12.4)

1803 (87.6)

  
  1. Data were presented as mean ± SD, median, min-max or n(%) unless otherwise stated. P < 0.05 was considered statistically significant difference. NS, no significant difference; SDB, sleep disorder breathing; SD, standard deviation; min-max, minimum and maximum interquartile range