Table 1.

Overview of the 16 experimental conditions of the full factorial design—every factor is balanced; therefore, each is present and absent an equal number of times.

Condition	Diagnostic interview	Preintervention motivational interviewing module	Guidance	Email reminders
1	✓a	✓	✓	✓
2	✓	✓	✓	—b
3	✓	✓	—	✓
4	✓	✓	—	—
5	✓	—	✓	✓
6	✓	—	✓	—
7	✓	—	—	✓
8	✓	—	—	—
9	—	✓	✓	✓
10	—	✓	✓	—
11	—	✓	—	✓
12	—	✓	—	—
13	—	—	✓	✓
14	—	—	✓	—
15	—	—	—	✓
16	—	—	—	—

^aFactor is present.

^bFactor is absent.