Table 1

RR of mortality corresponding to 3°C increases and decreases in a single day's average daily temperature above 28.2°C for Hong Kong 1998–2006

Variables	3.0°C increase above 28.2°C		3.0°C decrease below 28.2°C		N^†
Variables	RR (95% CI)	p Value	RR (95% CI)	p Value	N^†
All	1.055 (1.022 to 1.090)	0.001	1.021 (0.997 to 1.046)	0.022	129 688
Previous residence^‡ (proxy for migration status)
Hong Kong	1.057 (0.981 to 1.140)	0.146	1.024 (0.968 to 1.083)	0.406	24 393
China	1.050 (1.012 to 1.090)	0.010	1.022 (0.994 to 1.051)	0.127	99 195
Gender
Male	1.045 (1.001 to 1.092)	0.046	1.039 (0.995 to 1.085)	0.021	72 148
Female	1.068 (1.017 to 1.121)	0.008	1.000 (0.964 to 1.037)	0.990	57 538
Age, years
≥75	1.047 (1.002 to 1.094)	0.043	1.040 (1.007 to 1.075)	0.019	70 466
<75	1.065 (1.015 to 1.118)	0.011	0.998 (0.963 to 1.035)	0.928	52 793
Gender and age, years
Male ≥75	1.014 (0.951 to 1.082)	0.666	1.058 (1.008 to 1.110)	0.023	33 254
Male <75	1.067 (1.005 to 1.133)	0.034	1.023 (0.979 to 1.070)	0.308	38 546
Female ≥75	1.076 (1.012 to 1.143)	0.019	1.025 (0.979 to 1.072)	0.297	37 212
Female <75	1.061 (0.976 to 1.153)	0.117	0.952 (0.895 to 1.013)	0.117	20 070
SES of residential area^*
Low	1.065 (0.998 to 1.909)	0.056	0.981 (0.934 to 1.032)	0.461	38 249
Medium	1.038 (0.989 to 1.089)	0.129	1.029 (0.991 to 1.067)	0.135	68 952
High	1.003 (0.904 to 1.112)	0.961	1.015 (0.938 to 1.099)	0.708	15 080
Area of residence (proxy for urban design)
Hong Kong	1.043 (0.964 to 1.129)	0.296	1.022 (0.962 to 1.085)	0.489	25 954
Kowloon	1.041 (0.981 to 1.104)	0.183	1.004 (0.960 to 1.051)	0.852	46 974
New Territories	1.042 (0.984 to 1.103)	0.158	1.015 (0.972 to 1.061)	0.496	49 172
Unknown	1.278 (1.058 to 1.545)	0.011	1.313 (1.129 to 1.528)	0.000	7261
Marital status
Married	1.055 (1.007 to 1.105)	0.023	1.036 (1.001 to 1.072)	0.043	64 816
Unmarried	1.042 (0.989 to 1.099)	0.121	1.020 (0.981 to 1.061)	0.319	50 185
Cause of death
Cancer	1.010 (0.959 to 1.064)	0.715	1.002 (0.964 to 1.041)	0.938	50 619
Non-cancer	1.086 (1.041 to 1.132)	<0.001	1.034 (1.104 to 0.968)	0.035	79 069

↵* The proxy socioeconomic status (SES) variable was created first by matching individual‘area of residence’ within the mortality data to the median monthly domestic household income within that area of residence as reported by government tertiary planning units (the smallest geographical unit for which data are available). Resulted proxy SES was then categorised into SES low (HK$≤15 000 per month/US$23 077 per year), SES medium (HK$15 001–25 000 per month/US$23 077–38 462 per year) and SES high (HK$>25 000 per month/US$28 462 per year).
↵† N=129 688 non-accidental deaths were included in the analysis. Subgroup totals may not add up due to other or unknown cases.
↵‡ Not shown in this table: reported previous residence from other countries. Information available upon request.