Table 1. Spearman correlation coefficient (95% confidence intervals) between the monthly incidence of malaria and climate variables in Anhui Province, 1990–2009.

Region	MaxT	T	MinT	RH	Rainfall	MEI
Northern	L1 = 0.33	L1 = 0.32	L1 = 0.31	L0 = 0.33	L1 = 0.55	L1 = 0.19
	(0.22 to 0.42)	(0.21 to 0.42)	(0.20 to 0.41)	(0.20 to 0.45)	(0.47 to 0.64)	(0.07 to 0.33)
Mid	L1 = 0.23	L1 = 0.22	L1 = 0.21	L0 = 0.34	L2 = 0.53	L1 = 0.35
	(0.11 to 0.35)	(0.10 to 0.34)	(0.10 to 0.31)	(0.26 to 0.45)	(0.44 to 0.62)	(0.23 to 0.47)
Southern	L1 = 0.32	L1 = 0.32	L1 = 0.31	L1 = 0.23	L2 = 0.48	L1 = 0.39
	(0.19 to 0.44)	(0.20 to 0.44)	(0.21 to 0.42)	(0.08 to 0.33)	(0.37 to 0.59)	(0.28 to 0.49)

Lx: the lagged months. MaxT: average maximum temperature; T: average temperature; MinT: average minimum temperature; RH: relative humidity; MEI: multivariate El Niño/Southern Oscillation index.