Descriptive statistics of 30 693 adoptees and their adoptive (n=51 634) and biological parents 49 912 (132 239 individuals in total)
| Adoptees (n=30 693) | Adoptive parents (n=51 634) | Biological parents (n=49 912) | |
| Sex* | |||
| Female | 14 883 (48.49%) | 22 547 (43.67%) | 29 706 (59.52%) |
| IBS* | 776 (2.53%) | 660† (1.28%) | 840‡ (1.68%) |
| Female | 552 (1.80) | 433 (0.84) | 693 (1.39) |
| High education* (12 years or more) | 9004 (29.34%) | 9067 (17.67%) | 4973 (9.96%) |
| NDI (high socioeconomic status) | 407 (1.33%) | 4575 (8.86%) | 2426 (4.86%) |
| Occupation§ | 5775 (18.82%) | 5832 (11.29%) | 3475 (6.96%) |
| Age at IBS diagnosis (median and IQR) | 43 (35–49) | 71 (63–78) | 62 (55–69) |
| Age at end of follow-up (median and IQR) | 49 (43–54) | 76 (68–83) | 68 (60–75) |
*Number of observations (%).
†Four adoptees had two adoptive parents with IBS.
‡Eight adoptees had two biological parents with IBS.
§ Chief or occupation with a requirement for in-depth university competence.
IBS, irritable bowel syndrome; NDI, Neighbourhood Deprivation Index.