Table 2.

50% inhibitory concentrations and 95% confidence intervals of antimalarial drug susceptibility patterns of Plasmodium vivax, China^*

Drug	Culture time < 24 hours		Culture time ≥ 24 hours		All cases
	IC50, ng/mL	95% CI	IC50, ng/mL	95% CI	IC50, ng/mL	95% CI
Chloroquine	28.64	6.27–130.75	6.52	1.98–21.45	10.87	4.50–26.26
Mefloquine	4.15	1.05–16.38	4.25	1.31–13.79	4.21	1.88–9.42
Pyrimethamine	17.26	3.44–86.57	19.13	6.67–54.86	18.32	8.08–41.50
Quinine	20.63	7.53–56.58	7.89	3.14–19.79	11.82	6.20–22.56
Artesunate	0.20	0.12–0.33	0.10	0.05–0.18	0.13	0.09–0.20
Piperaquine	27.40	10.35–72.52	13.27	6.44–27.35	17.73	10.29–30.57
Primaquine	ND	ND	69.75	ND	69.75	ND

^*IC₅₀ = 50% inhibitory concentration; CI = confidence interval; ND = not done.