      Prenatal maternal smoking                 No    000                                              00.0                                              00     0.0        Yes                                       00    00.0                                             0.000                                        0    00.0   0.00       Number of household smokers               0     000                                              00.0                                              00     0.0        0                                         000   00.0                                             0.000                                        00   0.0    0.00       \>0                                       00    00.0                                             0.0000                                       00   0.0    0.000      Cigarettes per day by household smokers   0     000                                              00.0                                              00     0.0        0--00                                     000   00.0                                             0.000                                        00   0.0    0.000      \>00                                      00    00.0                                             0.000                                        0    0