Table 3. Reference probability and marginal effects of experiencing nausea or skin problems during the previous week (logistic regression, population averaged model).
| Variable | Marginal effect | Probability | p-value | 95% confidence interval for marginal effect |
| Outcome: Nausea last week | ||||
| Reference case estimated probability = 0.231 | ||||
| sex (male) | −0.018 | 21.3% | 0.488 | [−0.069,0.033] |
| 18–29 years old | 0.018 | 24.9% | 0.484 | [−0.033,0.070] |
| 40–49 years old | 0.028 | 25.9% | 0.374 | [−0.033,0.089] |
| 50+ years old | −0.014 | 21.7% | 0.759 | [−0.105,0.076] |
| −90 to −1 days | 0.048 | 27.9% | 0.286 | [−0.040,0.137] |
| 0 to 30 days (reference) | * | 23.1% | * | * |
| 31–90 days | −0.03 | 20.1% | 0.423 | [−0.103,0.043] |
| 91–180 days | −0.107 | 12.4% | 0.001 | [−0.169,−0.044] |
| 181–270 days | −0.099 | 13.2% | 0.004 | [−0.166,−0.031] |
| 271–360 days | −0.097 | 13.4% | 0.005 | [−0.164,−0.029] |
| 361–450 days | −0.109 | 12.2% | 0.001 | [−0.176,−0.043] |
| 451–540 days | −0.136 | 9.5% | 0.000 | [−0.202,−0.071] |
| 541–630 days | −0.154 | 7.7% | 0.000 | [−0.219,−0.089] |
| 631–720 days | −0.168a | 6.3% | 0.000 | [−0.231,−0.106] |
| 721–810 days | −0.185 | 4.6% | 0.000 | [−0.245,−0.124] |
| 811–900 days | −0.181 | 5.0% | 0.000 | [−0.241,−0.122] |
| 901–990 days | −0.184 | 4.7% | 0.000 | [−0.244,−0.125] |
| 991–1080 days | −0.190a | 4.1% | 0.000 | [−0.250,−0.131] |
| Outcome: Skin problems last week | ||||
| Reference case estimated probability = 0.507 | ||||
| sex (male) | −0.036 | 47.1% | 0.230 | [−0.096,0.023] |
| 18–29 years old | −0.01 | 49.7% | 0.725 | [−0.066,0.046] |
| 40–49 years old | −0.016 | 49.1% | 0.631 | [−0.082,0.050] |
| 50+ years old | −0.039 | 46.8% | 0.466 | [−0.142,0.065] |
| –90 to −1 days | 0.041 | 54.8% | 0.425 | [−0.060,0.142] |
| 0 to 30 days (reference) | * | 50.7% | * | * |
| 31–90 days | 0.001 | 50.8% | 0.979 | [−0.088,0.090] |
| 91–180 days | −0.122 | 38.5% | 0.002 | [−0.201,−0.043] |
| 181–270 days | −0.143 | 36.4% | 0.001 | [−0.229,−0.058] |
| 271–360 days | −0.173 | 33.4% | 0.000 | [−0.259,−0.087] |
| 361–450 days | −0.295 | 21.2% | 0.000 | [−0.376,−0.214] |
| 451–540 days | −0.325 | 18.2% | 0.000 | [−0.406,−0.244] |
| 541–630 days | −0.35 | 15.7% | 0.000 | [−0.431,−0.269] |
| 631–720 days | −0.405a | 10.2% | 0.000 | [−0.480,−0.330] |
| 721–810 days | −0.41 | 9.7% | 0.000 | [−0.484,−0.337] |
| 811–900 days | −0.42 | 8.7% | 0.000 | [−0.491,−0.348] |
| 901–990 days | −0.438 | 6.9% | 0.000 | [−0.509,−0.367] |
| 991–1080 days | −0.408a | 9.9% | 0.000 | [−0.479,−0.336] |
*Reference case is a female subject age 30–39, 1–30 days on ART.
a
Indicates p-value ≤0.05 for Wald test that marginal effect equals marginal effect for 271–360 days on ART.