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† RR (95% CI) p Value RR (95% CI) p Value 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.