Table 2.

Percent of Children With Respiratory Outcomes by Age and ETS Exposure

Household Exposure: Number of Cigarettes
Smoked in the Home per Day
Smoking During
Pregnancy
None1–19a≥20bNoYesc
Diagnosed asthma
 2 months to 2 years4.0  (2733)4.3  (1130)7.1*  (556)3.9  (3486)6.6*  (933)
 3–5 years
6.1  (2010)7.2  (876)11.1*  (373)6.3  (2628)9.8*  (631)
Chronic bronchitis
 2 months to 2 years 2.6  (2733)3.8*  (1130)7.4**  (556)2.7  (3486)6.3**  (933)
 3–5 years 3.4  (2010)4.0  (876)3.9  (373)3.7  (2628)3.4  (631)
≥3 Episodes of wheezing (past 12 months)
 2 months to 2 years 7.6  (2729)12.2**  (1129)15.7**  (555)8.0  (3482)15.8**  (931)
 3–5 years 7.4  (2005)8.8  (875)9.9  (373)7.6  (2623)9.9  (630)
  • a Contrast, 1–19 vs zero.b Contrast, ≥20 vs zero.c Contrast, yes vs no.

    0 = Sample size;

  • * P < .05;

  • ** P < .01.