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Table 4 Odds ratios (ORs) and 95% confidence intervals (CIs) for stratification of same-day respiratory causes of death

From: Mortality associated with wildfire smoke exposure in Washington state, 2006–2017: a case-crossover study

Category

Adjusted OR (95% CI)

N (%) with exposure variationa

All respiratory causes of death

 Age group

  0–4

1.52 (0.58, 3.97)

22 (0.7)

  5–14

  15–44

0.91 (0.45, 1.84)

43 (1.5)

  45–64

1.35 (1.09, 1.67)*

417 (14.2)

  65–84

1.08 (0.96, 1.21)

1518 (51.5)

  85+

1.00 (0.86, 1.16)

941 (32.0)

 Race

  White

1.12 (1.02, 1.22)*

2697 (91.6)

  Black

0.96 (0.53, 1.72)

62 (2.1)

  Native American

0.88 (0.43, 1.82)

42 (1.4)

  Hispanic

0.42 (0.19, 0.95)*

42 (1.4)

  Native Hawaiian/ Other Pacific Islander

0.70 (0.20, 2.41)

16 (0.5)

  Asian

0.88 (0.52, 1.53)

74 (2.5)

COPD causes of death

 Age group

  45–64

1.33 (1.00, 1.78)

238 (13.7)

  65–84

1.14 (0.99, 1.31)

1002 (57.9)

  85+

1.04 (0.85, 1.28)

481 (27.8)

  1. * p ≤ 0.05
  2. aPercent of cases, out of all cases whose strata have both wildfire smoke days and non-wildfire smoke days