Table 5.

The background characteristics that are associated with the frequency of ADR^†

Factors	Odds ratio	95% confidence interval
History of treatment with antiretrovirals	0.52	0.36–0.76
History of allergy	2.01	1.40–2.88
Complications	1.80	1.15–2.81
Number of concomitant anti-HIV drugs	1.36	1.10–1.69

For history of allergy, ‘unknown’ was regarded as ‘absent’; for CDC classification, ‘unknown’ was regarded as ‘category A’