Table 2 Demographic factors associated with smoking cessation during pregnancy, New South Wales, 2001–2011

Year of birth

2000-2001

Reference category

<0.001

2002-2003

1.00

[0.91,1.09]

2004-2005

1.07

[0.93,1.24]

2006-2007

1.28

[1.05,1.57]

2008-2009

3.37

[2.51,4.52]

2010-2011

6.91

[5.50,8.69]

Duration of pregnancy at first antenatal visit

<20 weeks

Reference category

<0.001

20+ weeks

0.79

[0.73,0.85]

Hospital type

Public

Reference category

<0.001

Private

1.61

[1.29,2.01]

SEIFA quintile (Education/Occupation)

1st (most advantaged)

1.70

[1.04,2.79]

2nd

1.07

[0.62,1.82]

3rd

1.34

[0.80,2.23]

4th

1.01

[0.61,1.68]

5th (most disadvantaged)

Reference category

0.116

Country of birth and Aboriginality

Australian born non-Aboriginal

Reference category

<0.001

Aboriginal

0.55

[0.50,0.61]

Non Australian born

1.60

[1.44,1.78]

Maternal age (years)

<20

0.53

[0.44,0.64]

20-34

0.87

[0.77,1.00]

35+

Reference category

<0.001

Number of previous pregnancies

0

Reference category

<0.001

1

0.45

[0.41,0.49]

2

0.36

[0.32,0.39]

3+

0.27

[0.24,0.30]

Remoteness (ARIA+)

Major city

Reference category

<0.001

Non-major city

0.44

[0.31,0.62]