Table 4.

Smoking maintenance, reduction and cessation in pregnancy, according to public maternity

	Maternity/City a
Maternal smoking	A Niterói	B Rio de Janeiro
No of smokers before pregnancy onsetb	104	183
Smoking Indicators (%)
Maintenance of frequency	62.5	53.0
Reduced frequency in the 1st trimester and kept	1.9	4.9
Reduced frequency in the 2st trimester and kept	5.8	6.6
Reduced frequency in the 3st trimester	1.9	0.5
Stopped in the 1st trimester	8.7	18.0
Stopped in the 2st trimester	13.5	11.5
Stopped in the 3st trimester	5.8	2.7
Reduced in the 1st trimester and stopped in the 2nd trimester	0.0	1.1
Reduced in the 2nd trimester and stopped in the 3rd trimester	0.0	1.6

^ap value = 0.13 (Pearson chi square test).

^bThe study excluded records with missing or ignored information for any questions on smoking and 8 records stated the onset and maintenance of smoking during pregnancy.

Note: Reduction of smoking habit frequency = daily to less than daily.