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 | |
Data are n (%), unless otherwise indicated. Difference between groups was assessed using Yates’ continuity correction
DNA-M DNA methylation, NA not applicable