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Table 1 Number and rate* (95% confidence interval) of twins in Canada (excluding Ontario) and the United States, 1991-2009

From: Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States

Year

Canada (excluding Ontario)

United States

 

Number of live births

Twin live births

Number of live births

Twin live births

  

Number

Rate (95% CI)

 

Number

Rate (95% CI)

1991

250847

5027

20.0 (19.5-20.6)

4110907

94779

23.1 (22.9-23.2)

1992

247898

5053

20.4 (19.8-20.9)

4065014

95372

23.5 (23.3-23.6)

1993

240468

4920

20.5 (19.9-21.0)

4000240

96445

24.1 (24.0-24.3)

1994

238069

5013

21.1 (20.5-21.6)

3952767

97064

24.6 (24.4-24.7)

1995

231813

5005

21.6 (21.0-22.2)

3899589

96736

24.8 (24.7-25.0)

1996

226180

5008

22.1 (21.5-22.8)

3891494

100750

25.9 (25.7-26.0)

1997

215588

4975

23.1 (22.4-23.7)

3880894

104137

26.8 (26.7-27.0)

1998

209795

5133

24.5 (23.8-25.1)

3941553

110670

28.1 (27.9-28.2)

1999

206169

5140

24.9 (24.3-25.6)

3959417

114307

28.9 (28.7-29.0)

2000

200476

5117

25.5 (24.8-26.2)

4058814

118916

29.3 (29.1-29.5)

2001

202036

5337

26.4 (25.7-27.1)

4025933

121246

30.1 (29.9-30.3)

2002

200287

5324

26.6 (25.9-27.3)

4021726

125134

31.1 (30.9-31.3)

2003

204279

5753

28.2 (27.4-28.9)

4089950

128665

31.5 (31.3-31.6)

2004

204521

5798

28.3 (27.6-29.1)

4112052

132219

32.2 (32.0-32.3)

2005

208416

5869

28.2 (27.5-28.9)

4138349

133122

32.2 (32.0-32.3)

2006

219202

6665

30.4 (29.7-31.1)

4265555

137085

32.1 (32.0-32.3)

2007

229428

6770

29.5 (28.8-30.2)

4316233

138961

32.2 (32.0-32.4)

2008

237342

6953

29.3 (28.6-30.0)

4247694

138660

32.6 (32.5-32.8)

2009

240823

7564

31.4 (30.7-32.1)

4130665

137217

33.2 (33.0-33.4)

  1. * Rates expressed per 1,000 live births.