CO Twin Registry: Table 4
Ages for Colorado Parents 1984 - 2004. (Mean and standard deviation)
| Year | All Births Mother | All Births Father | Twin Births Mother | Twin Births Father | CTR Twin Births Mother | CTR Twin Births Father |
|---|---|---|---|---|---|---|
| 1984 | 26.1 (5.3) | 29.1 (5.7) | 26.9 (5.0) | 29.7 (5.3) | 27.9 (4.6) | 30.0 (4.9) |
| 1985 | 26.2 (5.3) | 29.3 (5.7) | 27.7 (5.2) | 30.5 (5.5) | 29.0 (4.3) | 31.3 (5.4) |
| 1986 | 26.4 (5.4) | 29.6 (5.8) | 28.0 (5.3) | 30.7 (5.8) | 29.1 (4.9) | 30.7 (5.1) |
| 1987 | 26.6 (5.5) | 29.8 (5.8) | 27.6 (5.0) | 30.2 (5.2) | 38.8 (4.3) | 30.9 (4.9) |
| 1988 | 26.8 (5.6) | 30.1 (5.9) | 27.9 (5.6) | 30.8 (6.0) | 29.8 (4.8) | 31.7 (5.5) |
| 1989 | 26.9 (5.7) | 30.2 (6.0) | 28.0 (5.5) | 31.1 (6.0) | 30.1 (4.9) | 32.3 (5.2) |
| 1990 | 26.9 (5.8) | 30.3 (6.1) | 28.7 (5.6) | 31.7 (6.1) | 30.5 (4.5) | 32.4 (5.6) |
| 1991 | 26.9 (5.9) | 30.3 (6.2) | 28.5 (5.8) | 31.4 (6.4) | 30.2 (5.2) | 33.2 (6.0) |
| 1992 | 27.0 (6.0) | 30.4 (6.3) | 28.8 (5.8) | 31.9 (6.1) | 30.4 (5.1) | 33.7 (5.4) |
| 1993 | 27.1 (6.1) | 30.4 (6.4) | 28.7 (5.8) | 31.5 (6.5) | 29.6 (5.4) | 32.3 (6.2) |
| 1994 | 27.2 (6.2) | 30.1 (6.6) | 29.5 (6.1) | 32.1 (6.8) | 30.7 (5.7) | 33.5 (6.3) |
| 1995 | 27.2 (6.2) | 30.1 (6.7) | 29.6 (6.0) | 32.1 (6.6) | 30.8 (5.5) | 32.7 (6.4) |
| 1996 | 27.4 (6.2) | 30.2 (6.8) | 30.1 (6.2) | 32.8 (7.0) | 31.7 (6.1) | 33.6 (6.4) |
| 1997 | 27.3 (6.3) | 30.1 (6.8) | 29.8 (6.6) | 32.5 (7.4) | 31.8 (5.9) | 34.2 (7.2) |
| 1998 | 27.3 (6.3) | 30.1 (6.8) | 30.2 (6.2) | 32.5 (6.6) | 31.9 (5.4) | 33.4 (6.1) |
| 1999 | 27.3 (6.3) | 30.0 (6.8) | 29.8 (6.3) | 32.2 (6.8) | 31.0 (5.5) | 33.2 (6.3) |
| 2000 | 27.3 (6.2) | 30.0 (6.8) | 30.0 (6.6) | 32.7 (7.2) | 31.8 (5.7) | 34.0 (6.4) |
| 2001 | 27.4 (6.2) | 30.1 (6.8) | 30.1 (6.4) | 32.6 (7.0) | 31.5 (5.9) | 33.6 (6.7) |
| 2002 | 27.4 (6.2) | 30.1 (6.8) | 30.2 (6.7) | 32.8 (7.2) | 31.3 (6.2) | 33.6 (6.5) |
| 2003 | 26.7 (6.2) | 30.3 (6.7) | 30.1 (6.6) | 32.4 (7.3) | 31.4 (6.1) | 33.1 (7.3) |
| 2004 | 27.7 (6.2) | 30.4 (6.8) | 30.6 (6.4) | 33.1 (7.0) | 32.4 (5.5) | 34.1 (6.1) |
