. Author manuscript; available in PMC: 2012 Jan 12.

Published in final edited form as: Biodemography Soc Biol. 2011;57(1):3–32. doi: 10.1080/19485565.2011.564468

Table 3.

Effects of Smoking on Birth Weight

Smoking Indicator	OLS	2SLS	LIML
Smoking Indicator	Norway Sample
Smoking participation	−161.7^** (63.74)	−522.5^* (293.4) [−1641.4,228.1]	−614.4^* (371.5) [−1634.95, 219.5]
Number of cigarettes	−12.66 (8.26)	−46.21^** (22.85) [−110.4, −5.0]	−52.3^* (27.02) [−110.5, −5.27]
	Add Health Sample
Smoking participation	−154.907^* (88.511)	−586.857 (409.118) [−2134, 215]	−616.7 (440.255) [−2129, 191]

Heteroscedasticity-robust asymptotic standard errors are in parentheses. 95% weak-instrument robust confidence bounds for 2SLS and LIML are in brackets.

Each set of rows is from a separate regression

p< 0.1,

^**

p< 0.05.