Relationship between onset of peptic ulcer and meteorological factors

Table 1 The 7 meteorological factors

MF	Symbol	Unit
Average temperature of 1 month, ten days and five days	Tpj	0C
Average highest temperature of 1 month, ten days and five days	Tmax	0C
Average lowest temperature of 1 month, ten days and five days	Tmin	0C
Average air pressure of 1 month, ten days and five days	P	hPa
Average relative humidity of 1 month, ten days and five days	FF	%
Average dew point temperature of 1 month, ten days and five days	Td	0C
Average total amount of precipitation of 1 month, ten days and five days	RR	mm

Table 2 Correlated analysis of DRPU and 7 MFs

Related DRPU	Group	Related coefficient	P value
Monthly average temperature	72	-0.8704	<0.01
Average ten-day temperature	216	-0.6624	<0.01
Average five-day temperature	432	-0.5384	<0.01
Average monthly highest temperature	72	-0.8000	<0.01
Average ten-day highest temperature	216	-0.6470	<0.01
Average five-day highest temperature	432	-0.5167	<0.01
Average monthly lowest temperature	72	-0.8091	<0.01
Average ten-day lowest temperature	216	-0.6617	<0.01
Average five-day lowest temperature	432	-0.5384	<0.01
Average monthly air pressure	72	0.7230	<0.01
Average ten-day air pressure	216	0.5777	<0.01
Average five-day air pressure	432	0.4579	<0.01
Average monthly relative humidity	72	-0.2334	>0.05
Average ten-day relative humidity	216	-0.1364	>0.05
Average five-day relative humidity	432	-0.0657	>0.05
Average monthly dew point temperature	72	-0.7812	<0.01
Average ten-day dew point temperature	216	-0.6246	<0.01
Average five-day dew point temperature	432	-0.4936	<0.01
Monthly precipitation	72	-0.2013	>0.05
Ten-day precipitation	216	-0.0916	>0.05
Five-day precipitation	432	-0,0418	>0.05

The results of regressive effect analysis indicated that the 3 multiple regressive equations based on DRPU and variation of the 5 MFs had remarkable effects.

Table 3 Correlated analysis of DRPU and 5 MFs of the previous month, ten days, and five days

Related DRPU	Group	Related coefficient	P value
Average monthly temperature	71	-0.6621	<o.o1
Average ten-day temperature	215	-0.6302	<o.o1
Average five-day temperature	431	-0.5324	<o.o1
Average monthly highest temperature	71	-0.6291	<o.o1
Average ten-day highest temperature	215	-0.6097	<o.o1
Average five-day highest temperature	431	-0.5123	<o.o1
Average monthly lowest temperature	71	-0.6781	<o.o1
Average ten-day lowest temperature	215	-0.6350	<o.o1
Average five-day lowest temperature	431	-0.5348	<o.o1
Average monthly air pressure	71	0.7628	<o.o1
Average ten-day air pressure	215	0.5942	<o.o1
Average five-day air pressure	431	0.4840	<o.o1
Average monthly dew point temperature	71	-0.7220	<o.o1
Average ten-day dew point temperature	215	-0.6171	<o.o1
Average five-day dew point temperature	431	-0.5077	<o.o1

The above analysis showed that the 3 forecast equations had good regressive effect. The real test values of the three forecast equations were 71.8%, 67.9% and 66.6%, respectively.