Table 2.
Background variables (n=286)
| Cohort | 82–85 cohort | 91–92 cohort | 99–00 cohort | |||||||
| Participated/eligible* | Term-born | 46/46 | (100) | − | 35/35 | (100) | − | 57/57 | (100) | − |
| EP-born | 49/51 | (96) | 35/35 | (100) | 64/88 | (73) | ||||
| Female sex, n (%), p value | Term-born | 21 | (46) | − | 22 | (63) | − | 27 | (47) | − |
| EP-born | 21 | (43) | 22 | (63) | 31 | (48) | ||||
| Final Height in cm, mean (SD), p value | Term-born | 174 | (8) | 0.04 | 171 | (9) | 0.09 | 177 | (10) | <0.001 |
| EP-born | 170 | (8) | 167 | (9) | 168 | (10) | ||||
| Adult Weight in kg, mean (SD), p value | Term-born | 73 | (14) | 0.73 | 73 | (14) | 0.34 | 73 | (14) | 0.02 |
| EP-born | 74 | (18) | 69 | (14) | 66 | (14) | ||||
| Self-reported smoking, n (%), p value | Term-born | 16 | (35) | 0.42 | 8 | (23) | 0.04 | −† | − | − |
| EP-born | 21 | (43) | 2 | (6) | 2 | (6) | ||||
| Atopy, n (%), p value | Term-born | 20 | (43) | 0.13 | 8 | (23) | 0.78 | 20 | (40) | 0.04 |
| EP-born | 13 | (28) | 9 | (26) | 12 | (22) | ||||
| Wheeze last 12 months, n (%), p value | Term-born | 17 | (38) | 0.27 | 15 | (43) | 0.34 | 7 | (13) | 0.10 |
| EP-born | 24 | (49) | 19 | (54) | 15 | (24) | ||||
| Asthma med. last 12 months, n (%), p value | Term-born | 6 | (13) | 0.34 | 4 | (13) | 0.17 | 3 | (5) | 0.25 |
| EP-born | 10 | (20) | 9 | (26) | 7 | (11) | ||||
| Asthma ever, n (%), p value | Term-born | 9 | (20) | 0.06 | 10 | (29) | 0.14 | 5 | (9) | <0.001 |
| EP-born | 18 | (37) | 16 | (46) | 22 | (35) | ||||
| Current asthma, n (%), p value | Term-born | 6 | (13) | 0.10 | 8 | (23) | 0.29 | 4 | (7) | 0.31 |
| EP-born | 13 | (27) | 12 | (34) | 8 | (13) | ||||
The listed variables ‘Allergy’, ‘self-reported smoking’, ‘wheeze last 12 months’ and ‘asthma med. last 12 months’ refer to the number (fraction) with a least one positive response or finding at any visit. ‘Current asthma’ refers to a combination of wheeze in the last 12 months plus a positive response to the questions ‘asthma ever’ or ‘asthma medication last 12 months’ on minimum one visit. P value refers to comparisons between EP and term-born (Welch’s t-test for continuous data and Pearson’s χ2 test for categorical data).
*At least one visit (all percentage and p values are based only on visits where the subject participated).
†Data not presented due to large amount of missing data.
Adult weight, weight at 25 years (or 18 years if not applicable); Asthma med, asthma medication; EP, subjects born extremely preterm or with extremely low birth weight (gestational age ≤28 weeks or birth weight ≤1000 g); Final height, the height achieved at 18 or 25 years, whichever was highest.