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) |  |  |