Table 4 |
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|
Rates of mortality from diseases of the circulatory system in winter and non-winter months, ratio of rates and relative change in winter:non-winter ratios for potential modifying factors; 1996–2000 |
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|
Rate per 10,000 person years (No of deaths)* |
Winter:non-winter ratio (95% CI)‡ Unadjusted |
Winter:non-winter ratio relative to baseline category§ (95% CI)‡ |
p-value |
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|
Winter |
Non-winter |
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|
|
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|
All |
33.7 (20664) |
27.4 (33576) |
1.24 (1.13, 1.36) |
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|
|
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|
Age (years): |
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|
0–4 |
0.1 (3) |
0.2 (18) |
0.33 (.09, 1.22) |
1.00† |
|
|
5–14 |
0.1 (6) |
0.0 (8) |
1.50 (0.52, 4.31) |
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|
15–29 |
0.4 (50) |
0.4 (112) |
0.89 (0.62, 1.27) |
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|
30–59 |
6.8 (1678) |
6.2 (3065) |
1.05 (0.76, 1.46) |
1.30 (0.90, 1.90) |
|
|
60–79 |
100.7 (8057) |
83.1 (13264) |
1.16 (0.95, 1.40) |
1.40 (1.00, 1.96) |
|
|
80+ |
640.2 (10870) |
505.1 (17109) |
1.25 (1.13, 1.37) |
1.44 (0.99, 2.08) |
p = .22 |
|
Gender: |
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|
Male |
33.8 (10148) |
28.0 (16773) |
1.28 (1.13, 1.46) |
1.00 |
|
|
Female |
33.6 (10516) |
26.9 (16803) |
1.21 (1.06, 1.37) |
1.06 (0.94, 1.19) |
p = .33 |
|
Ethnicity^: |
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|
Non-Maori |
32.3 (19071) |
26.2 (30797) |
1.27 (1.15, 1.40) |
1.00 |
|
|
Maori |
55.8 (1593) |
46.7 (2779) |
1.18 (0.96, 1.44) |
0.93 (0.81, 1.07) |
p = .32 |
|
NZDep96: |
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|
1–3 |
28.7 (4742) |
23.5 (7733) |
1.20 (1.01, 1.42) |
1.00 |
|
|
4–6 |
34.2 (6325) |
27.9 (10292) |
1.23 (1.05, 1.45) |
1.07 (0.92, 1.24) |
|
|
7–10 |
36.4 (9597) |
29.6 (15551) |
1.28 (1.10, 1.49) |
1.04 (0.90, 1.20) |
p = .67 |
|
RHA: |
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|
North |
29.1 (6132) |
23.7 (9997) |
1.24 (1.03, 1.49) |
1.00 |
|
|
Midland |
34.4 (4200) |
27.7 (6754) |
1.34 (1.11, 1.62) |
0.97 (0.83, 1.15) |
|
|
Central |
35.7 (5338) |
28.7 (8563) |
1.17 (0.97, 1.42) |
1.00 (0.85, 1.18) |
|
|
South |
38.2 (4994) |
31.7 (8262) |
1.21 (1.00, 1.48) |
0.96 (0.81, 1.13) |
p = .93 |
|
|
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|
* No of deaths in winter correspond to a 4 month period; non-winter, an 8 month period ‡ Generalised negative binomial regression model; overdispersion a linear combination of age group and ethnicity § Adjusted for all other covariates including covariate by winter interaction terms † Because of small cell counts, age group 0–29 years was used as the baseline category ^ Mortality rates have been age-standardised to account for different population structures of Maori and Non-Maori |
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|
Davie et al. BMC Public Health 2007 7:263 doi:10.1186/1471-2458-7-263 |
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