Table 4.

Ridge regression coefficients between monthly climatic variables and logarithmic incidence of bacillary dysentery (with k = 0.5, 1950–1996, Shenyang, China)

Duration	R2	Minimum temperature	Average temperature	Maximum temperature	Air pressure	Relative humidity	Precipitation	Evaporation	Long-term Effect	Season
1950–1966, Jan – Jul	0.718	0.079*	0.072*	0.051*	-0.042	0.053	0.156*	0.032	0.458*	0.110*
1950–1966, Aug – Dec	0.818	0.109*	0.075*	0.067*	-0.093*	-0.047	0.068	0.148*	0.442*	-0.084*
1967–1976, Jan – Jul	0.653	0.138*	0.115*	0.106*	-0.097*	0.149*	0.096	-0.009	0.142*	0.106*
1967–1976, Aug – Dec	0.768	0.101*	0.092*	0.076*	-0.156*	0.103	0.013	0.073*	0.338*	-0.101*
1977–1986, Jan – Jul	0.490	0.072*	0.046	0.063*	-0.033	0.222*	0.119	0.114*	0.111	0.052
1977–1986, Aug – Dec	0.822	0.113*	0.127*	0.153*	-0.118*	-0.041	0.065	0.189*	-0.094*	-0.125*
1987–1996, Jan – Jul	0.822	0.131*	0.115*	0.100*	-0.069*	0.148*	0.207*	-0.017	-0.140*	-0.154*
1987–1996, Aug – Dec	0.892	0.154*	0.144*	0.142*	-0.101*	0.048	0.058	0.125*	-0.132*	-0.135*
1950–1996, Jan – Jul	0.306	0.107*	0.082*	0.080*	-0.030	0.018	0.131*	-0.027	0.045	0.111*
1950–1996, Aug – Dec	0.430	0.134*	0.105*	0.094*	-0.110*	-0.116*	0.062	0.071*	0.016	-0.116*

* P < 0.05