Table 1.
Demographic characteristics, risk factors and lung function values and their differences between the children with or without ever wheezing.
| Total (142) |
Wheezing: No (72) |
Wheezing: Yes (70) |
p * | |
|---|---|---|---|---|
| Age (years) | 5.37 (1.64) | 5.22 (1.65) | 5.53 (1.63) | 0.27 |
| Number of episodes | -- | -- | 1.37 (0.65) | -- |
| Gestational age (weeks) | 27.7 (1.94) | 27.76 (2.04) | 27.77 (1.84) | 0.98 |
| Birthweight (g) | 1034.3 (309) | 1021.4 (287.6) | 1047.6 (331.1) | 0.62 |
| Birthweight (z-score) | −0.33 (0.73) | −0.37 (0.79) | −0.28 (0.65) | 0.47 |
| Corrected age at test (months) | 25.8 (15.7) | 24.2 (16.4) | 27.4 (14.8) | 0.23 |
| BPD | 88 (62.0%) | 38 (52.8%) | 50 (71.4%) | 0.022 |
| Invasive ventilation | 95 (66.9%) | 48 (66.7%) | 47 (67.1) | 0.95 |
| Day-care attendance in the first year | 97(68.3%) | 46 (63.9%) | 51 (72.9%) | 0.25 |
| Male sex | 84 (59.2%) | 44 (61.1%) | 40 (57.1%) | 0.63 |
| Smoking during pregnancy | 27 (19.3%) | 11 (15.5%) | 16 (23.2%) | 0.25 |
| FVC (z-score) | −1.12 (0.57) | −1.10 (0.63) | −1.14 (0.51) | 0.72 |
| FEV0.5 (z-score) | −2.09 (0.87) | −1.94 (0.93) | −2.24 (0.79) | 0.044 |
| FEV0.5/FVC (z-score) | −0.45 (1.29) | −0.27 (1.36) | −0.62 (1.20) | 0.11 |
| FEF75 (z-score) | −1.47 (0.91) | −1.34 (0.93) | −1.61 (0.87) | 0.07 |
| FEF25-75 (z-score) | −1.54 (0.95) | −1.35 (0.97) | −1.73 (0.90) | 0.02 |
| Allergic mother | 21(15.2%) | 5 (7%) | 16 (23.9%) | 0.008 |
| Rehospitalisation due to respiratory causes | 37 (18.4%) | 13 (13.3%) | 24 (23.3%) | 0.06 |
Indicates number of cases (percentage) or mean (SD). * Difference between the proportion of children with wheezing according to each risk factor.