Table 2 Bivariate association between substance use outcomes, age at menarche and other potential covariates among 14-15 year old Canadian girls

Age at menarche

   Early

28 (30.9)

2.42 (0.76-7.64)

41 (46.2)

1.86 (0.74-4.68)

27 (30.0)

3.46 (0.85-14.07)

   Average

104 (21.6)

1.48 (0.55-4.00)

181 (37.4)

1.30 (0.62-2.72)

136 (28.1)

3.15 (0.84-11.83)

   Late

15 (15.6)

1

31 (31.6)

1

11 (11.02)

1

Household income

   Lowest & Lower middle

10 (21.6)

1.44 (0.47-4.43)

21 (45.0)

1.68 (0.50-5.66)

10 (22.5)

0.88 (0.26-3.00)

   Middle

41 (25.6)

1.80 (0.84-3.89)

69 (43.2)

1.56 (0.81-3.01)

42 (26.4)

1.09 (0.53-2.27)

   Upper middle

58 (25.7)

1.81 (0.94-3.49)

85 (37.8)

1.24 (0.69-2.23)

61 (27.2)

1.14 (0.62-2.07)

   Highest

39 (16.1)

1

79 (32.8)

1

60 (24.8)

1

Residence

   Rural

19 (24.9)

1.20 (0.67-2.17)

38 (48.6)

1.66 (0.95-2.89)

27 (35.6)

1.69 (0.95-3.03)

   Urban

128 (21.6)

1

216 (36.3)

1

146 (24.6)

1

PMK education

   Less than secondary

20 (28.9)

2.01 (0.84-4.86)

28 (41.0)

1.51 (0.69-3.28)

20 (29.2)

1.56 (0.65-3.72)

   Secondary school graduation

38 (24.4)

1.60 (0.80-3.18)

65 (41.8)

1.56 (0.86-2.81)

40 (25.7)

1.30 (0.69-2.47)

   Beyond high school

39 (24.8)

1.64 (0.83-3.24)

62 (39.3)

1.40 (0.75-2.62)

52 (32.9)

1.85 (0.94-3.62)

   College or university degree

47 (16.8)

1

90 (31.6)

1

59 (20.9)

1

Province of residence‡

   Eastern

16 (28.8)

2.07 (1.06-4.06)

21 (38.2)

0.83 (0.45-1.54)

15 (27.4)

1.35 (0.66-2.77)

   Central

100 (23.6)

1.58 (0.90-2.79)

151 (35.5)

0.74 (0.43-1.26)

116 (27.4)

1.35 (0.75-2.43)

   Western

31 (16.3)

1

82 (42.7)

1

42 (21.8)

1

PMK immigration status

   No

131 (23.8)

2.11 (0.83-5.40)

215 (39.0)

1.67 (0.75-3.73)

149 (27.1)

1.61 (0.69-3.74)

   Yes

14 (12.9)

1

31 (27.7)

1

21 (18.7)

1

Living with both parents

   No

38 (29.5)

1.66 (0.91-3.04)

59 (45.6)

1.50 (0.81-2.76)

43 (33.1)

1.56 (0.82-2.99)

   Yes

109 (20.1)

1

194 (35.9)

1

130 (24.1)

1

Relationship with mother

   Very close

52 (16.0)

1

102 (31.2)

1

66 (20.3)

1

   Somewhat close

71 (25.4)

1.79 (1.02-3.13)

116 (41.6)

1.57 (0.97-2.53)

86 (30.7)

1.74 (1.01-3.00)

   Not very close

21 (37.4)

3.12 (1.10-8.89)

31 (54.4)

2.63 (0.91-7.57)

20 (34.2)

2.04 (0.76-5.44)

Relationship with father

   Very close

32 (14.1)

1

65 (28.6)

1

36 (15.9)

1

   Somewhat close

60 (20.8)

1.61 (0.87-2.97)

108 (37.6)

1.50 (0.86-2.62)

77 (26.8)

1.94 (1.09-3.44)

   Not very close

42 (39.5)

3.99 (1.95-8.18)

62 (57.6)

3.39 (1.68-6.85)

45 (41.9)

3.82 (1.88-7.76)

Work for pay

   No

32 (25.0)

1

42 (33.1)

1

28 (22.1)

1

   Yes

116 (21.6)

0.83 (0.44-1.56)

212 (39.4)

1.32 (0.79-2.20)

146 (27.1)

1.31 (0.72-2.38)

School performance

   Very well/Well

58 (13.9)

1

125 (29.9)

1

78 (18.6)

1

   Average/Poor/Very poor

80 (35.0)

3.33 (1.96-5.68)

118 (51.3)

2.47 (1.49-4.10)

84 (36.9)

2.57 (1.56-4.23)

Self score

-

0.86 (0.78-0.95)

-

0.89 (0.82-0.96)

-

0.89 (0.81-0.97)