Comparison of background characteristics in infants with cystic fibrosis* and healthy controls
| Infants with CF* (n=71) | Healthy controls (n=54) | Δ (95% CI), CF – controls | p Value | |
| Boy, n (%) | 33 (46) | 27 (50) | –4% (–21% to 13%) | 0.696 |
| Gestational age, weeks | 39.3 (1.5) | 40.2 (1.2) | –0.9 (–1.4 to –0.5) | <0.001 |
| Birth weight, z-score† | –0.34 (0.96) | 0.01 (0.84) | –0.35 (–0.67 to –0.03) | 0.035 |
| Birth weight below 10th percentile,† n (%) | 16 (23) | 2 (4) | 19% (7% to 30%) | 0.003 |
| White mother, n (%) | 62 (87) | 47 (87) | 0% (–12% to 13%) | 0.962 |
| Maternal smoking during pregnancy, n (%) | 8 (11) | 4 (7) | 4% (–7% to 14%) | 0.456 |
| Current maternal smoking, n (%) | 9 (13) | 5 (9) | 4% (–8% to 15%) | 0.540 |
| Mother in non-manual occupation | 49 (69) | 43 (80) | –11% (–25% to 5%) | 0.171 |
| Fathers in non-manual occupation§ | 41 (59) | 40 (75) | –15% (–30% to 2%) | 0.055 |
| Maternal asthma, n (%) | 13 (18) | 10 (19) | 0% (–14% to 13%) | 0.976 |