Table 3 Motivational interviewing quality and CHOICE dosage in years 1 and 2

Percent complex reflections

32 (14)

28 (16)

− 0.78

− 0.29 (− 1.02, 0.44)

26 (15)

32 (9)

1.19

0.44 (− 0.30, 1.18)

− 6 (− 13, 1),

− 1.62,

− 0.42 (− 1.14, 0.31)

4 (− 3, 12), 1.12,

0.30 (− 0.45, 1.04)

3.73, .046

Percent open questions

59 (14)

58 (13)

− 0.16

− 0.06 (− 0.79, 0.67)

59 (15)

64 (17)

0.75

0.28 (− 0.46, 1.01)

1 (− 9, 10),

0.16,

0.04 (− 0.68, 0.76)

6 ( 4, 17), 1.23,

0.33–0.42, 1.07)

0.60, −.007

Reflection question ratio

.67 (.19)

.66 (.32)

− 0.16

− 0.06 (− 0.79, 0.67)

.56 (.24)

.88 (.29)

3.07*

1.14 (0.34, 1.92)

− 0.11(− 0.30, 0.08), − 1.18,

− 0.30 (− 1.02, 0.42)

0.22 (0.03, 0.42), 2.33^,

0.62 (− 0.14, 1.38)

6.24, 086

Percent MI adherent

88 (16)

94 (8)

1.27

0.47 (− 0.27, 1.21)

81 (21)

95 (7)

2.80*

1.04 (0.25, 1.81)

− 8 (− 18, 2),

− 1.59,

− 0.41 (− 1.13, 0.32)

1 (− 9, 11), 0.23,

0.06 (− 0.68, 0.80)

1.62, .011

Dosage

Control (N = 11)

Intervention (N = 14)

t (50)

d (95% CI)

Control (N = 15)

Intervention (N = 14)

t (50)

d (95% CI)

F (1, 50) partial ω²

Percent attendance across sessions, M (SD)

76 (14)

79 (13)

0.69

0.28 (− 0.52, 1.07)

69 (13)

75 (9)

1.38

0.51 (−0.23, 1.25)

− 7 (− 15, 2),

− 1.51, − 0.42 (− 1.19, 0.36)

−4 (− 12, 5), − 0.89, − 0.24 (− 0.98, 0.51)

0.25, −.015