Table 4 Multivariable Poisson regression for mental health outcomes and its association with substance using classes

Age

0.96

(0.93, 1.00)

0.96

(0.93, 0.99)

−0.41

(−0.66, −0.15)

−0.39

(−0.65, −0.14)

Chinese ethnicity (Ref = Non-Chinese)

0.87

(0.72, 1.04)

0.87

(0.72, 1.04)

−1.92

(−3.43, − 0.40)

−1.86

(−3.37, − 0.34)

Cisgender male (Ref = Transgender, genderqueer, or others)

0.89

(0.69, 1.15)

0.88

(0.69, 1.14)

−2.48

(−4.55, − 0.42)

−2.13

(−4.22, − 0.04)

Gay (Ref = Bisexual, queer, or others)

1.04

(0.88, 1.24)

1.06

(0.89, 1.26)

−0.55

(−1.7, − 0.69)

0.04

(− 1.22, 1.31)

Monthly household income ≥ SGD5000 (Ref < SGD5000)

1.00

(0.86, 1.18)

1.02

(0.87, 1.20)

0.33

(− 0.83, 1.50)

0.69

(− 0.48, 1.86)

 Substance-naïve

Ref

Ref

Ref

Ref

Ref

Ref

Ref

Ref

 Substance-novice

1.12

(0.94, 1.33)

1.16

(0.97, 1.38)

−0.52

(−1.81, 0.78)

− 0.11

(− 1.43, 1.21)

 Chemsex

1.61

(1.31, 1.99)

1.64

(1.33, 2.03)

3.51

(0.66, 6.36)

3.69

(0.87, 6.51)