. 2020 Jun 17;7:2055668320926046. doi: 10.1177/2055668320926046

Table 4.

Linear mixed effects models for factors associated with ALP Phase, n = 74.

Variable	Mean ALP (median)	Fixed effects Coefficient (95% CI) p value	Random effects Coefficients (SD)
Individual models			Subject	Device used
Age (mean)	2.32 (2)	0.03 (0.01–0.05) <0.001^a	0.92 (0.92)	0.02 (0.13)
Gross Motor Function Classification System
IV–V	2.01 (2)	Reference level
I–III	2.86 (3)	0.83 (0.34–1.31) 0.0013^b	0.96 (0.98)	0.02 (0.14)
Manual Abilities Classification System (MACS and mini-MACS)
IV–V	1.95 (2)	Reference level
I–III	2.56 (2)	0.63 (0.15–1.12) 0.01^c	1.02 (1.01)	0.01 (0.14)
Communication Function Classification System
CFCS IV–V	1.99 (2)	Reference level
CFCS I–III	3.47 (3)	1.50 (1.00–2.00) <0.001^a	0.73 (0.86)	0.02 (0.14)
Level of Sitting Scale
1–4	2.19 (2)	Reference level
5–8	2.51 (2)	0.35 (–0.16 to 0.86) 0.2	1.09 (1.05)	0.02 (0.13)
Access method
Switch	1.45 (1)	Reference level
Joystick	2.73 (3)	0.76 (0.76–1.68) <0.001^a	0.79 (0.89)	0.02 (0.13)

Random intercept model
Communication Function Classification System			Subject	Device used
IV–V	1.99 (2)	Reference level	0.56 (0.75)	0.02 (1.13)
I–III	3.47 (3)	1.20 (0.74–1.67) <0.001^a
Access method
Switch	1.45 (1)	Reference level
Joystick	2.73 (3)	0.92 (0.51–1.33) <0.001^a
Intercept		1.39 (1.04–1.75) <0.001^a

Interaction model
Communication Function Classification			Subject	Device used
IV–V	1.99 (2)	Reference level	0.54 (0.73)	0.02 (0.13)
I–III	3.47 (3)	–0.46 (–2.02 to 1.08) 0.56
Access method
Switch	1.45 (1)	Reference level
Joystick	3.47 (3)	0.80 (0.39–1.21) <0.001^a
CFCS I–III: Joystick		1.82 (0.21–3.44) 0.03^c
Intercept		1.47 (1.12–1.82) <0.001^a

ALP: Assessment of Learning Powered mobility use; CI: confidence interval; SD: standard deviation.

^ap $\leq$ $0.001 .$

^bp $\leq$ $0.01 .$

^cp $\leq$ $0.05$ .