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- Out of the 41,739 live births in 1999, only 1,032 or 2.5% were multiple births. A set of quadruplets was born in B.C. in 1999, for the first time since 1993. Based on this pattern, a set of quadruplets is born in the province once in approximately 268,500 live births.
- Of all live births in 1999:
- Almost all of the births (97.5%) were singletons (40,707)
- One twin was born out of every 43 live births (967 twins)
- One other multiple birth (triplet or more) was born out of approximately every 641 live births (61 triplets and 4 quadruplets).
- Older mothers, 35 years of age or older, had the highest proportion of multiple births; 242 births or 3.2% of live births to these mothers were multiple births. The 768 multiple births to mothers aged 20 to 34 years accounted for 2.4% of births to mothers in this age group. The lowest proportion of multiple births were to teenage mothers; the 22 twins born to teenage mothers accounted for 1.1% of births to mothers in this age group.
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