Table 1 Characteristics of conscripts, who were evaluated at the draft board and had a Boerge Prien test (BPP)
Otitis media hospitalisation in childhood | |||
|---|---|---|---|
Variables | Yes | No | Total |
Men evaluated by the draft board, n (%) | 1000 (5.4%) | 17 412 (94.6%) | 18 412 (100%) |
BPP score, median (interquartile range) | 42 (35–48) | 44 (38–50) | 44 (38–50) |
Proportion with a BPP score in the bottom quartile (%) | 312 (31.2%) | 4370 (25.1%) | 4682 (25.4%) |
Birth weight in grams, median (interquartile range) | 3450 (3125–3760) | 3510 (3160–3875) | 3500 (3150–3875) |
Gestational age, no. (%) | |||
Preterm (<37 weeks) | 53 (5.3%) | 648 (3.7%) | 701 (3.8%) |
Term (31–41 weeks) | 708 (70.8%) | 12 762 (73.3%) | 13 470 (73.2%) |
Post-term (≥42 weeks) | 66 (6.6%) | 1209 (6.9%) | 1275 (6.9%) |
Missing | 2793 (16.0%) | 173 (17.3%) | 2966 (16.1%) |
Small for gestational age, no. (%) | |||
Yes | 17 (1.7%) | 141 (0.8%) | 158 (0.9%) |
No | 808 (80.8%) | 14 385 (82.6%) | 15 193 (82.5%) |
Missing | 175 (17.5%) | 2886 (16.6%) | 3061 (16.6%) |
Apgar score at 5 minutes after birth, no. (%) | |||
<7 | 6 (0.6%) | 99 (0.6%) | 105 (0.6%) |
≥7 | 908 (90.8%) | 16 077 (92.3%) | 16 985 (92.2%) |
Missing | 86 (8.6%) | 1236 (7.1%) | 1322 (7.2%) |
Maternal age, n (%) | |||
≤ 20 years | 100 (10.0%) | 1638 (9.4%) | 1738 (9.4%) |
21–35 years | 852 (85.2%) | 14 794 (84.9%) | 15 646 (84.9%) |
> 35 years | 48 (4.8%) | 980 (5.6%) | 1028 (5.6%) |
Mothers’ marital status at subject′s birth, n (%) | |||
Married | 595 (59.5%) | 11 033 (63.4%) | 11 628 (63.2%) |
Unmarried | 341 (34.1%) | 5366 (30.8%) | 5707 (31%) |
Missing | 64 (6.4%) | 1013 (5.8%) | 1077 (5.9%) |
Birth order, n (%) | |||
1 | 320 (32.0%) | 6063 (34.8%) | 6383 (34.7%) |
2 | 368 (36.8%) | 6148 (35.3%) | 6516 (35.4%) |
3 | 183 (18.3%) | 3173 (18.2%) | 3356 (18.2%) |
4+ | 129 (12.9%) | 2026 (11.6%) | 2155 (11.7%) |
Missing | 0 (0%) | 2 (0.01%) | 2 (0.01%) |
Mode of delivery, no. (%) | |||
Vaginal | 796 (79.6%) | 14 170 (81.4%) | 14 966 (81.3%) |
Caesarean | 119 (11.9%) | 1626 (9.3%) | 1745 (9.5%) |
Forceps or vacuum extraction | 85 (8.5%) | 1616 (9.3%) | 1701 (9.2%) |
Hearing score at conscription, no. (%) | |||
Severe hearing impairment | 78 (7.8%) | 754 (4.3%) | 832 (4.5%) |
Moderate hearing impairment | 274 (27.4) | 3902 (22.4%) | 4176 (22.7%) |
No hearing impairment | 641 (64.1%) | 12 653 (72.7%) | 13 294 (72.2%) |
Missing | 7 (0.7%) | 103 (0.6%) | 110 (0.6%) |