Table 9.
Cox Regressions Predicting Monozygotic (MZ) Twin Pairs Discordant for Depression (During/after12RP and After12RP) From Kessler Perceived Social Support (KPSS), Personal Stressful Life Events (SLE) and the KPSS × SLE Interaction
| N | Full model | KPSS | Personal SLE |
KPSS ⍰⍰SLE |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -2ΔLL | Wald | Wald | -2ΔLL | Wald | -2ΔLL | ||||||||
| Δ χ23 | p | OR | p | OR | p | Δ χ21 | p | OR | p | Δ χ21 | p | ||
| Major Depression (MD) | |||||||||||||
| Onset during/after 12mth SLE reporting period (During/after12RP) | |||||||||||||
| M & F | 164 | 5.64 | .130 | 1.06 | .641 | 1.24 | .085 | 3.12 | .077 | 0.81 | .105 | 2.97 | .085 |
| M | 51 | 3.85 | .278 | 0.93 | .752 | 1.22 | .406 | 0.46 | .499 | 0.58 | .073 | 3.62 | .057 |
| F | 113 | 3.65 | .302 | 1.10 | .574 | 1.25 | .119 | 2.73 | .098 | 0.87 | .330 | 1.04 | .308 |
| Onset after 12mth SLE reporting period (After12RP) | |||||||||||||
| M & F | 147 | 3.62 | .306 | 1.09 | .557 | 1.11 | .437 | 0.58 | .448 | 0.79 | .097 | 3.19 | .074 |
| M | 44 | 3.98 | .264 | 0.96 | .881 | 1.17 | .560 | 0.12 | .727 | 0.53 | .062 | 4.11 | .043 |
| F | 103 | 1.65 | .648 | 1.11 | .536 | 1.10 | .536 | 0.45 | .504 | 0.87 | .322 | 1.08 | .298 |
| Sub-Clinical Depression (SCD) | |||||||||||||
| Onset during/after 12mth SLE reporting period (During/after12RP) | |||||||||||||
| M & F | 238 | 5.53 | .137 | 1.07 | .532 | 1.14 | .185 | 2.32 | .128 | 0.84 | .077 | 3.40 | .065 |
| M | 77 | 6.52 | .089 | 1.12 | .534 | 1.27 | .215 | 1.19 | .276 | 0.62 | .024 | 5.70 | .017* |
| F | 161 | 1.95 | .583 | 1.05 | .709 | 1.11 | .336 | 1.26 | .262 | 0.92 | .413 | 0.70 | .404 |
| Onset after 12mth SLE reporting period (After12RP) | |||||||||||||
| M & F | 210 | 4.46 | .216 | 1.05 | .672 | 1.11 | .348 | 1.42 | .234 | 0.84 | .084 | 3.27 | .071 |
| M | 70 | 6.02 | .111 | 1.10 | .628 | 1.32 | .242 | 1.67 | .196 | 0.61 | .038 | 4.86 | .027 |
| F | 140 | 1.29 | .732 | 1.03 | .833 | 1.06 | .626 | 0.43 | .511 | 0.91 | .359 | 0.88 | .349 |
Note: p: For males & females (M & F), p < .050 (*) were significant at α = .050 and p < .010 (**) were significant at α = .010; For M or F, we used a Bonferroni correction (p/2), so p < .025 (*) were significant at α = .050 and p < .005 (**) were significant at α = .010.