Table 5.

PD values for interactions between pairs of factors on the incidence of HFMD.

Risk factors	AT	RH	GDP	FI	TI	PD0_9
RH	0.28
GDP	0.31	0.28
FI	0.17	0.16	0.24
TI	0.31	0.32	0.34	0.26
PD0_9	0.31	0.33	0.35	0.30	0.42
MSD	0.23	0.21	0.29	0.19	0.26	0.27

Note: AT: average temperature; RH: relative humidity; GDP: gross domestic product; FI: first industry; TI: tertiary industry; PD0_9: aged 0–9 population density; MSD: middle school density.