Table 1.

Samples By Sexual Orientation and Survey Year in the British Columbia Adolescent Health Survey

	1998		2003		2008		2013
	n(%w)	${\overline{M}}_{\mathit{\text{age}}}$ [95% CI]	n(%w)	${\overline{M}}_{\mathit{\text{age}}}$ [95% CI]	n(%w)	${\overline{M}}_{\mathit{\text{age}}}$ [95% CI]	n(%w)	$\overline{M}\mathit{\text{age}}$ [95% CI]]
Males
Heterosexual	10,223 (93.8)	14.82 [14.70, 14.95]	13,880 (95.3)	15.04 [14.98, 15.09]	11,573 (94.1)	15.00 [14.96, 15.04]	10,024 (93.2)	14.98 [14.94, 15.02]
Mostly Hetero.	418 (4.2)	15.24 [15.07, 15.41]	432 (3.2)	15.39 [15.25, 15.53]	459 (3.9)	15.55 [15.47, 15.64]	463 (4.4)	15.54 [15.46, 15.62]
Bisexual	127 (1.1)	14.74 [14.55, 14.93]	122 (0.9)	15.52 [15.34, 15.69]	141 (1.2)	15.55 [15.41, 15.70]	153 (1.4)	15.59 [15.49, 15.68]
Gay	84 (0.9)	15.25 [15.00, 15.49]	89 (0.6)	15.86 [15.73, 15.99]	104 (0.9)	15.76 [15.57, 15.95]	118 (1.1)	15.73 [15.61, 15.85]
Females
Heterosexual	10,829 (90.3)	14.79 [14.68, 14.89]	13,013 (87.4)	14.87 [14.80, 14.93]	11,268 (86.7)	14.98 [14.94, 15.03]	9,601 (85.6)	14.89 [14.85, 14.93]
Mostly Hetero.	919 (7.6)	15.59 [15.44, 15.73]	1,304 (9.2)	15.58 [15.49, 15.66]	1,200 (9.6)	15.55 [15.48, 15.62]	1,019 (9.5)	15.62 [15.55, 15.69]
Bisexual	217 (1.9)	15.48 [15.28, 15.68]	428 (3.0)	15.61 [15.49, 15.73]	444 (3.2)	15.44 [15.32, 15.56]	468 (4.0)	15.55 [15.46, 15.64]
Lesbian	41 (0.3)	14.75 [14.63, 14.86]	55 (0.3)	14.93 [14.80, 15.06]	65 (0.5)	15.58 [15.41, 15.76]	92 (0.9)	15.48 [15.37, 15.58]

Note. Percentages are weighted.