Twin births and fertility treatment in the environmental health study
| TWI region | RVC region | OWC region | Total | |
|---|---|---|---|---|
| TWI, toxic waste incinerator; RVC, Rhine Valley control; OWC, Odenwald control. | ||||
| *χ2, p<0.05. | ||||
| †n = 2 had missing answers for fertility consultation. | ||||
| Twin births | ||||
| % | 5.3* | 1.6 | 2.3 | 3.8 |
| (n) | (18/340) | (2/122) | (4/174) | (24/636) |
| Fertility treatment | ||||
| % | 10.4 | 10 | 11.5 | 10.6 |
| (n) | (35/340) | (12/120†) | (20/174) | (67/634) |
| Twin birth without fertility treatment | ||||
| % | 5.2* | 0.9 | 2.6 | 3.7 |
| (n) | (16/305) | (1/108) | (4/154) | (21/567) |
| Twin birth with fertility treatment | ||||
| % | 5.7 | 8.3 | – | 4.5 |
| (n) | (2/35) | (1/12) | (0/20) | (3/67) |