Table 1 Characteristics of subjects with available methylation data compared to the participants of the total
|  | Total participants n = 436 (%) | Participants with DNA-M data n = 170 (%) | P value |
|---|---|---|---|
Maternal smoking during pregnancy | |||
 Yes | 146 (36.6) | 61 (37.0) | > 0.999 |
 No | 253 (63.4) | 104 (63.0) |  |
Maternal history of asthma | |||
 Yes | 64 (18.4) | 27 (18.2) | > 0.999 |
 No | 284 (81.6) | 121 (81.8) |  |
 Missing | 88 | 22 |  |
Maternal history of eczema | |||
 Yes | 143 (41.6) | 65 (40.4) | 0.846 |
 No | 201 (58.4) | 96 (59.6) |  |
 NA | 92 | 9 |  |
Child eczema | |||
 Yes | 58 (15.8) | 29 (18.7) | 0.442 |
 No | 308 (84.2) | 126 (81.3) |  |
 Missing | 70 | 15 |  |
Child wheeze | |||
 Yes | 67 (18.4) | 32 (20.6) | 0.625 |
 No | 298 (81.6) | 123 (79.4) |  |
 Missing | 71 | 15 |  |
Maternal fish intake | |||
 Never | 159 (61.9) | 70 (61.4) | 0.801 |
 1–2 or less per month | 74 (28.8) | 32 (28.1) |  |
 1–3 per week | 21 (8.2) | 11 (9.6) |  |
 4 or more times per week | 2 (0.8) | 0 (0) |  |
 Uncertain | 1 (0.4) | 1 (0.9) |  |
 Missing | 179 | 52 |  |
Maternal socioeconomic status | |||
 Below low | 77 (19.3) | 25 (15.1) | 0.273 |
 Low | 97 (24.3) | 54 (32.5) |  |
 Medium Low | 114 (28.5) | 48 (28.3) |  |
 Medium | 61 (15.3) | 24 (14.5) |  |
 High | 51 (12.8) | 16 (9.6) |  |
 NA | 36 | 3 |  |