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Table 1 Evolution for the study period of several population variables.

From: Smoking among pregnant women in Cantabria (Spain): trend and determinants of smoking cessation

 

Year

 

Variable

1998

(n = 315)

1999

(n = 316)

2000

(n = 302)

2001

(n = 306)

2002

(n = 320)

P-value

Age in years, mean ± SD

28.6 ± 5.0

29.6 ± 5.3

29.9 ± 4.9

29.9 ± 4.5

30.1 ± 4.9

< 0.001a

Primiparous, n (%)

135 (42.9)

137 (43.4)

140 (46.4)

130 (42.5)

141 (44.1)

0.603b

Education higher than secondary school, n (%)

181 (57.5)

155 (49.1)

121 (40.1)

121 (39.5)

180 (56.2)

< 0.001b

Married, n (%)

279 (88.6)

292 (92.4)

274 (90.7)

278 (90.8)

295 (92.2)

0.367b

Employment out home, n (%)

161 (51.1)

173 (54.7)

144 (47.7)

146 (47.7)

149 (46.6)

0.164b

Social class I-II, n (%)

41 (13.0)

37 (11.7)

49 (16.2)

37 (12.1)

36 (11.2)

0.227b

Kessner index: adequate prenatal care, n (%)

122 (38.7)

99 (31.3)

95 (31.5)

128 (41.8)

159 (49.7)

< 0.001b

Smokers prior to pregnancy, n (%)

169 (53.6)

163 (51.6)

132 (43.7)

135 (44.1)

126 (39.4)

< 0.001b

   No. cig/d, mean ± SD

14.5 ± 7.6

14.9 ± 8.7

15.9 ± 8.6

17.1± 11.1

16.0 ± 8.9

0.207a

Smoking during the whole pregnancy, n (%)

106 (33.7)

115 (36.4)

108 (35.8)

104 (34.0)

100 (31.2)

0.367b

  1. a One-way analysis of variance
  2. b Mantel-Haenszel trend test