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. Author manuscript; available in PMC: 2010 Oct 12.
Published in final edited form as: Gen Hosp Psychiatry. 2006 Sep–Oct;28(5):408–413. doi: 10.1016/j.genhosppsych.2006.05.007

Table 4.

Between-pairs and within-pair associations between the IES and self-reported general health in MZ and DZ twins as adjusted for sociodemographic factors and depression

Zygosity IESa Overall Between pairs Within pairs
ORb 95% CI OR 95% CI OR 95% CI
MZ (n = 1923 twins) Lowest quartile 1.0 – 1.0 – 1.0 –
Second quartile 0.9 0.7–1.2 0.9 0.6–1.3 1.0 0.7–1.3
Third quartile 1.1 0.8–1.4 1.1 0.7–1.7 1.0 0.7–1.4
Highest quartile 1.5 1.2–2.0 1.8 1.2–2.7 1.2 0.8–1.7
Ptrend<.01 Ptrend=.02 Ptrend=.41
Pbetween vs. within=.25
DZ (n = 1513 twins) Lowest quartile 1.0 – 1.0 – 1.0 –
Second quartile 1.0 0.8–1.4 1.2 0.8–1.8 0.8 0.5–1.2
Third quartile 1.2 0.9–1.6 1.4 0.9–2.1 1.0 0.7–1.4
Highest quartile 1.4 1.1–1.9 1.8 1.2–2.8 1.1 0.7–1.6
Ptrend<.01 Ptrend=.20 Ptrend=.20
Pbetween vs. within=.81
a

Lowest quartile, 0–2; second quartile, 3–16; third quartile, 17–28; highest quartile, 29–55.

b

OR adjusted for age, sex, race, education and depression.