Table 2.

Clarity ratings for preliminary smartphone survey items.

Smartphone EMA construct measured	Clarity rating*
Pain intensity	9.8 ± 0.4
Pain interference	9.8 ± 0.4
Pain bothersomeness	5.6 ± 3.3
Stiffness	9.4 ± 1.3
Fatigue	10 ± 0
Sleep quality	9.8 ± 0.4
Positive affect	10 ± 0
Negative affect	9.8 ± 0.4
Anxiety	10 ± 0
Stress	10 ± 0
Social contact	9.8 ± 0.4
Loneliness	10 ± 0
Flare-up	9 ± 1.4
Physical activity	9.8 ± 0.4
Sedentary time	9.4 ± 1.3

^*Data are presented as mean ± standard deviation.

EMA, ecological momentary assessment.