Table 1.
Number and rate* (95% confidence interval) of twins in Canada (excluding Ontario) and the United States, 1991-2009
|
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) |
* Rates expressed per 1,000 live births.