Table 4. Reference probability and marginal effects of feeling unwell on day before interview (logistic regression, population averaged model).

Variable	Marginal effect	Probability	p-value	95% confidence interval for marginal effect
Outcome: Felt unwell physically yesterday (part or all of the day)
Reference case estimated probability  = 0.404
sex (male)	−0.055	34.9%	0.030	[−0.104,−0.005]
18–29 years old	−0.033	37.1%	0.186	[−0.082,0.016]
40–49 years old	0.086	49.0%	0.003	[0.030,0.142]
50+ years old	0.081	48.5%	0.062	[−0.004,0.166]
–90 to −1 days	0.054	45.8%	0.299	[−0.048,0.155]
0 to 30 days (reference)	*	40.4%	*	*
31–90 days	−0.074	33.0%	0.092	[−0.160,0.012]
91–180 days	−0.127	27.7%	0.001	[−0.204,−0.050]
181–270 days	−0.166	23.8%	0.000	[−0.247,−0.084]
271–360 days	−0.186	21.8%	0.000	[−0.267,−0.106]
361–450 days	−0.197	20.7%	0.000	[−0.277,−0.117]
451–540 days	−0.222	18.2%	0.000	[−0.302,−0.142]
541–630 days	−0.184	22.0%	0.000	[−0.268,−0.101]
631–720 days	−0.176b	22.8%	0.000	[−0.257,−0.094]
721–810 days	−0.187	21.7%	0.000	[−0.265,−0.109]
811–900 days	−0.19	21.4%	0.000	[−0.265,−0.114]
901–990 days	−0.195	20.9%	0.000	[−0.270,−0.120]
991–1080 days	−0.174b	23.0%	0.000	[−0.250,−0.099]
Outcome: Felt sad, depressed, or stressed yesterday (all or part of the day)
Reference case estimated probability  = 0.236
sex (male)	−0.018	21.8%	0.334	[−0.056,0.019]
18–29 years old	−0.011	22.5%	0.565	[−0.048,0.026]
40−49 years old	0.041	27.7%	0.078	[−0.005,0.087]
50+ years old	0.064	30.0%	0.086	[−0.009,0.136]
−90 to −1 days	0.114	35.0%	0.017	[0.021,0.207]
0 to 30 days (reference)	*	23.6%	*	*
31–90 days	0.028	26.4%	0.47	[−0.049,0.105]
91–180 days	0.004	24.0%	0.899	[−0.063,0.072]
181–270 days	−0.035	20.1%	0.339	[−0.107,0.037]
271–360 days	−0.015	22.1%	0.692	[−0.088,0.059]
361–450 days	−0.035	20.1%	0.347	[−0.107,0.038]
451–540 days	−0.069	16.7%	0.057	[−0.141,0.002]
541–630 days	0.001	23.7%	0.973	[−0.076,0.079]
631–720 days	0.013b	24.9%	0.737	[−0.062,0.088]
721–810 days	−0.035	20.1%	0.321	[−0.104,0.034]
811–900 days	0.015	25.1%	0.678	[−0.055,0.084]
901–990 days	0.043	27.9%	0.224	[−0.026,0.113]
991–1080 days	0.076a	31.2%	0.035	[0.005,0.146]

*Reference case is a female subject age 30–39, 0–30 days on ART.

^aIndicates p-value ≤0.05 for Wald test that marginal effect equals marginal effect for 271–360 days on ART.

^bIndicates p-value >0.05 for Wald test that marginal effect equals marginal effect for 271–360 days on ART.