Description of participating cohorts.
| Study and enrolment period | Total subjects n | Measurement age# years | Age years | |
| At baseline | At end of follow-up | |||
| ABCD, The Netherlands | ||||
| 2003–2004 | 2783 | 4, 5, 7 | 4.1±0.6 | 6.8±0.9 |
| BAMSE, Sweden | ||||
| 1994–1996 | 2268 | 4, 8 | 4.0±0.2 | 8.1±0.4 |
| DARC, Denmark | ||||
| 1998–1999 | 348 | 3, 6 | 3.0±0.2 | 6.1±0.1 |
| EDEN, France | ||||
| 2003–2006 | 592 | 4, 5, 6, 7, 8 | 4.8±0.8 | 7.8±0.6 |
| Generation R Study, The Netherlands | ||||
| 2002–2006 | 1169 | 4, 6 | 3.8±0.1 | 6.1±0.3 |
| GINIplus, Germany | ||||
| 1995–1998 | 3309 | 4, 5, 6 | 4.2±0.4 | 5.8±0.5 |
| INMA_M, Menorca, Spain | ||||
| 1997–1998 | 249 | 4, 6 | 4.2±0.1 | 6.7±0.2 |
| INMA_V, Valencia, Spain | ||||
| 2003–2005 | 426 | 4, 7, 9 | 4.3±0.1 | 8.0±0.6 |
| KOALA, The Netherlands | ||||
| 2002–2003 | 1471 | 4, 6, 8 | 5.0±0.5 | 7.8±0.6 |
| LISAplus, Germany | ||||
| 1997–1998 | 1881 | 4, 5, 6 | 4.3±0.4 | 5.8±0.4 |
| MAS, Germany | ||||
| 1990 | 969 | 4, 5, 6, 7 | 4.1±0.1 | 7.0±0.5 |
| PIAMA, The Netherlands | ||||
| 1996–1997 | 2989 | 4, 5, 6, 7, 8 | 4.4±0.6 | 8.0±0.6 |
| RHEA, Greece | ||||
| 2007–2008 | 526 | 4, 7 | 3.6±0.6 | 6.6±0.3 |
| Bologna Birth Cohort (ROBBIC), Italy | ||||
| 2004–2005 | 189 | 3, 8 | 3.6±0.4 | 7.8±0.5 |
| Roma Birth Cohort (ROBBIC), Italy | ||||
| 2003–2004 | 452 | 3–4, 7, 8 | 4.1±0.2 | 8.6±0.3 |
| SWS, UK | ||||
| 1998–2007 | 1509 | 3, 6, 8 | 3.1±0.1 | 8.3±1.2 |
| All participants | ||||
| NA | 21 130 | NA | 4.1±0.6 | 7.1±1.2 |
Data are presented as mean±sd, unless otherwise stated. Only children with body mass index data for at least two follow-ups, who were non-obese at baseline and had information on at least one asthma or asthma-related phenotype were included. NA: not applicable. #: age when anthropometric measurements collected.