Table 4.
Adjusteda Prevalence Ratios and 95% Confidence Intervals for Asthma Outcomes by Quartile of Maximum H2S Exposure Concentrations at Either Current Home or Workplace for Study Participants, Rotorua, New Zealand, 2008-10.
| Outcome | % Overall | Q1 (0-17 ppb) | Q2 (18-29 ppb) | Q3 (30-44 ppb) | Q4 (45-64 ppb) | P-value Trend |
|---|---|---|---|---|---|---|
| Wheeze or whistling | 28.5% | 1.00 | 0.98 (0.81, 1.19) | 0.87 (0.71, 1.08) | 0.80 (0.65, 0.99) | 0.02 |
| Woken with chest tightness | 14.7% | 1.00 | 0.91 (0.67, 1.25) | 0.90 (0.65, 1.25) | 0.88 (0.63, 1.22) | 0.42 |
| Shortness of breath at rest | 9.7% | 1.00 | 0.96 (0.64, 1.42) | 0.73 (0.47, 1.15) | 0.92 (0.61, 1.38) | 0.45 |
| Woken by shortness of breath | 8.7% | 1.00 | 0.78 (0.51, 1.19) | 0.80 (0.52, 1.24) | 0.64 (0.41, 1.00) | 0.06 |
| Woken by coughing | 23.3% | 1.00 | 1.09 (0.86, 1.38) | 0.85 (0.65, 1.11) | 1.11 (0.88, 1.40) | 0.79 |
| Ever asthma diagnosis | 24.2% | 1.00 | 0.90 (0.71, 1.14) | 0.88 (0.69, 1.12) | 0.83 (0.65, 1.05) | 0.12 |
| Current asthma treatment | 13.1% | 1.00 | 1.01 (0.72, 1.42) | 0.87 (0.61, 1.24) | 0.75 (0.52, 1.08) | 0.09 |
| Current asthma | 16.7% | 1.00 | 1.00 (0.74, 1.34) | 0.93 (0.68, 1.27) | 0.83 (0.60, 1.13) | 0.22 |
Abbreviations: Q, quartile
a
Adjusted for variables in Table 2