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. 2007 Jun 28;115(10):1394–1400. doi: 10.1289/ehp.10155

Table 5.

Summary estimates, 95% CIs and data descriptions for household SHS exposure comparisons grouped by type of asthma.a

Asthma type
Percentile
Type of combined estimate of RRb No. RR 95% CI p-Value Min 25th 75th Max
Current
 Uncorrected 15 1.30 1.22–1.39 0.249* 0.86 1.24 1.60 2.17
 Correctedc 11 1.25 1.21–1.30 0.528 0.88 1.23 1.38 2.17
Ever
 All studiesc,d 23 1.48 1.32–1.65 <0.001* 0.57 1.45 1.74 5.81
 Household SHS 17 1.51 1.31–1.75 <0.001* 0.94 1.47 1.73 5.81
 Maternal smoking 6 1.29 1.15–1.45 0.190* 1.21 1.21 1.98 2.77
Incident
 All studies 8 1.21 1.08–1.36 0.225* 0.84 1.08 1.33 1.49
 Household SHS 4 1.13 0.89–1.44 0.544 0.84 0.92 1.26 1.27
 Maternal smoking 4 1.24 1.06–1.45 0.074* 1.08 1.08 1.45 1.49

Abbreviations: CI, confidence interval; Max, maximum value of the distribution; Min, minimum value of the distribution; p-value, value from the p distribution for the null hypothesis that the rate ratio is constant across studies.

a

We report random effects estimates.

b

We report corrected estimates unless otherwise indicated.

c

We removed four studies from the analysis of current asthma (Azizi et al. 1995; Daigler et al. 1991; Murray and Morrison 1990; Palmieri et al. 1990) and one study from the analysis of ever asthma (Pokharel et al. 2001) for lack of enough information to convert odds ratios into estimates of RR.

d

Excluded six studies already included in the current asthma analysis.

*

Heterogeneity.