Table 1. General characteristics of study population (n = 5301).
| Variables | Total (N = 5301) | No chronic condition (n = 4539) | Asthma (n = 235) | Eczema (n = 192) | ADHD (n = 51) | Dyslexia (n = 207) | Migraine/ severe headache (n = 77) |
|---|---|---|---|---|---|---|---|
| Children | |||||||
| Sex | |||||||
| Male | 2650 (50.0) | 2242 (49.4) | 141 (60.0) | 87 (45.3) | 29 (56.9) | 118 (57.0) | 33 (42.9) |
| Female | 2651 (50.0) | 2297 (50.6) | 94 (40.0) | 105 (54.7) | 22 (43.1) | 89 (43.0) | 44 (57.1) |
| Age in years, mean (SD) 7.55±2.30 | |||||||
| 4 | 634 (12.0) | 570 (12.6) | 25 (10.6) | 28 (14.6) | 7 (13.7) | 1 (0.5) | 3 (3.9) |
| 5 | 654 (12.3) | 579 (12.8) | 33 (14.0) | 27 (14.1) | 8 (15.7) | 3 (1.4) | 4 (5.2) |
| 6 | 654 (12.3) | 582 (12.8) | 27 (11.5) | 25 (13.0) | 4 (7.8) | 7 (3.4) | 9 (11.7) |
| 7 | 680 (12.8) | 579 (12.8) | 38 (16.2) | 24 (12.5) | 10 (19.6) | 18 (8.7) | 11 (14.3) |
| 8 | 645 (12.2) | 549 (12.1) | 24 (10.2) | 23 (12.0) | 10 (19.6) | 26 (12.6) | 13 (16.9) |
| 9 | 663 (12.5) | 557 (12.3) | 23 (9.8) | 22 (11.5) | 5 (9.8) | 46 (22.2) | 10 (13.0) |
| 10 | 667 (12.6) | 551 (12.1) | 35 (14.9) | 20 (10.4) | 3 (5.9) | 46 (22.2) | 12 (15.6) |
| 11 | 704 (13.3) | 572 (12.6) | 30 (12.8) | 23 (12.0) | 4 (7.8) | 60 (29.0) | 15 (19.5) |
| Ethnic background | |||||||
| Native Dutch | 4273 (80.6) | 3655 (80.5) | 177 (75.3) | 142 (74.0) | 46 (90.2) | 188 (90.8) | 65 (84.4) |
| Immigrant, Western | 324 (6.1) | 275 (6.1) | 18 (7.7) | 14 (7.3) | 0 (0.0) | 14 (6.8) | 3 (3.9) |
| Immigrant, Non-western | 704 (13.3) | 609 (13.4) | 40 (17.0) | 36 (18.8) | 5 (9.8) | 5 (2.4) | 9 (11.7) |
| Body mass index | |||||||
| Normal weight | 3755 (70.8) | 3221 (71.0) | 161 (68.5) | 142 (74.0) | 33 (64.7) | 135 (65.2) | 63 (81.8) |
| Overweight | 397 (7.5) | 323 (7.1) | 28 (11.9) | 18 (9.4) | 3 (5.9) | 20 (9.7) | 5 (6.5) |
| Obese | 113 (2.1) | 93 (2.0) | 5 (2.1) | 6 (3.1) | 4 (7.8) | 4 (1.9) | 1 (1.3) |
| Unknown | 1036 (19.5) | 902 (19.9) | 41 (17.4) | 26 (13.5) | 11 (21.6) | 48 (23.2) | 8 (10.4) |
| Family structure | |||||||
| Two parent family | 4683 (88.3) | 4049 (89.2) | 193 (82.1) | 157 (81.8) | 43 (84.3) | 181 (87.4) | 60 (77.9) |
| Single parent family | 590 (11.1) | 466 (10.3) | 41 (17.4) | 35 (18.2) | 7 (13.7) | 25 (12.1) | 16 (20.8) |
| Other/Unknown | 28 (0.5) | 24 (0.5) | 1 (0.4) | 0 (0.0) | 1 (2.0) | 1 (0.5) | 1 (1.3) |
| Number of acute health complaints | |||||||
| None | 3596 (67.8) | 3180 (70.1) | 140 (59.6) | 104 (54.2) | 25 (49.0) | 133 (64.3) | 14 (18.2) |
| 1 | 1139 (21.5) | 927 (20.4) | 55 (23.4) | 59 (30.7) | 18 (35.3) | 48 (23.2) | 32 (41.6) |
| 2 | 450 (8.5) | 356 (7.9) | 26 (11.1) | 23 (12.0) | 7 (13.7) | 16 (7.7) | 22 (28.6) |
| 3 or more | 116 (2.2) | 76 (1.7) | 14 (6.0) | 6 (3.1) | 1 (2.0) | 10 (4.8) | 9 (11.7) |
| Parental education level | |||||||
| Low | 713 (13.4) | 603 (13.3) | 34 (14.5) | 31 (16.1) | 9 (17.6) | 24 (11.6) | 12 (15.6) |
| Medium | 1689 (31.9) | 1423 (31.4) | 76 (32.3) | 62 (32.3) | 21 (41.2) | 73 (35.3) | 34 (44.2) |
| High | 2230 (42.1) | 1936 (42.7) | 91 (38.7) | 78 (40.6) | 14 (27.5) | 94 (45.4) | 17 (22.1) |
| Unknown | 669 (12.6) | 577 (12.7) | 34 (14.5) | 21 (10.9) | 7 (13.7) | 16 (7.7) | 14 (18.2) |
Values are numbers and percentages. Bold print indicates significant difference (p<0.05) of children with only one condition (asthma, eczema, dyslexia, ADHD, or migraine/severe headache) compared with children without chronic conditions.