Table 2.
McNemar's test of association between occurrence of events prior to age 17 and BMI discordant in 2002 of all*, monozygotic (MZ) and dizygotic (DZ) twin pairs
| Life events prior to 17 | All twin pairs (DZ + MZ + Unknown) | DZ twin pairs | MZ twin pairs | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nr.of exposeda (case) | Nr.of exposeda (control) | Chi(2) | OR (95% CI) P | Nr.of exposedta (case) | Nr.of exposeda (control) | Chi(2) | OR (95% CI) p | Nr.of exposeda (case) | Nr.of exposeda (control) | Chi(2) | OR (95% CI) p | |
| Lived in a children's home (n = 22) | 4 (11) | 4 (11) | 0.00 | 1.00 (0.19–5.37) 1.00 | 2 (5) | 3 (6) | 0.20 | 0.67 (0.06–5.82) 0.65 | 1 (4) | 1 (4) | 0.00 | 1.00 (0.13–78.50) 1.00 |
| Separation from mother (n = 49) | 9 (23) | 10 (24) | 0.05 | 0.90 (0.32–2.46) 0.82 | 6 (15) | 8 (17) | 0.29 | 0.75 (0.21–2.46) 0.59 | 2 (6) | 1 (5) | 0.33 | 2.00 (0.10–117.99) 0.56 |
| Separation from father (n = 61) | 11 (29) | 9 (27) | 0.20 | 1.22 (0.46–3.34) 0.65 | 7 (19) | 7 (19) | 0.00 | 1.00 (0.30–3.34) 1.00 | 3 (8) | 1 (6) | 1.00 | 3.00 (0.24–157.49) 0.32 |
| Any separationa (n = 70) | 10 (33) | 9 (32) | 0.05 | 1.11 (0.41–3.09) 0.82 | 7 (23) | 7 (23) | 0.00 | 1.00 (0.30–3.34) 1.00 | 3 (8) | 1 (6) | 1.00 | 3.00 (0.24–157.49) 0.32 |
*
Including DZ, MZ and unknown twin pairs.
a
Discordant twin pairs which the twin (case) had experienced, but the co‐twin (control) had not experienced.
b
Discordant twin pairs which the twin (control) had experienced, but the co‐twin (case) had not experienced.
c
Either experienced mother, father or lived in a children's home.