Respiratory function at 1 year by maternal smoking postnatally
| Mother smoker (n=38) | Mother non-smoker (n=62) | 95% CI of difference between smoker and non-smoker | |
|---|---|---|---|
| Age (weeks) | 56.0 (5.6) | 55.9 (4.4) | –1.9 to 2.1 |
| Body weight (kg) | 9.8 (1.3) | 10.0 (1.1) | –0.6 to 0.3 |
| Crown–heel length (cm) | 77.2 (2.6) | 77.9 (2.7) | –1.8 to 0.4 |
| Urinary cotinine:creatinine (ng:mg)a | 157.8 (92.3–300.5) | 30.0 (13.5–55.4) | 3.6 to 7.74-153 |
| FRCpleth (ml) | 243 (44) | 251 (41) | –26 to 9 |
| Rawii(kPa/l.s) | 2.76 (1.42) | 2.06 (1.14) | 0.16 to 0.254-150 |
| Rawee (kPa/l.s) | 3.03 (1.62) | 2.10 (1.00) | 0.40 to 1.454-151 |
| sGawii (/s/kPa) | 1.81 (0.63) | 2.27 (0.70) | –0.73 to –0.184-151 |
| sGawee (/s/kPa) | 1.66 (0.60) | 2.20 (0.69) | –0.81 to –0.274-153 |
| sCrs (kPa) | 0.58 (0.09) | 0.61 (0.10) | –0.07 to 0.01 |
| tptef:te | 0.297 (0.084) | 0.300 (0.076) | –0.036 to 0.029 |
| Respiratory rate (bpm) | 29 (3) | 30 (4) | –2 to 1 |
Abbreviations as for footnote to table 1. aUrinary cotinine:creatinine ratios shown as geometric means (interquartile ranges) and their ratio (95% CI) with:without exposure to maternal smoking. Other values are mean (SD).
↵4-150 p⩽0.05;
↵4-151 p⩽0.01;
↵4-153 p⩽0.001 (two sided t test for independent samples).