Table 3 Wald test results, examining distinct differences across the outcome categories

Persistent use vs. Persistent non-use

10.14

8

<0.001

Persistent use vs. Ex-use

5.60

8

<0.001

Persistent use vs. Initiation

3.74

8

<0.001

Persistent non-use vs.

Ex-use

3.38

8

<0.001

Persistent non-use vs. Initiation

7.36

8

<0.001

Initiation vs. Ex-use

2.80

8

0.005