Table 4.

Questionnaire score range, internal consistency, and floor and ceiling effect

Questionnaire	Number of items	Item completion rate (%)	Median (IQR)	Range*	Possible range†	Cronbach’s alpha‡	Flooring effect (%)	Ceiling effect (%)
PCS	13	100	8.5 (1–19)	0–52	0–52	0.93	28 (21)	1 (0.75)
PIPS	12	100	34 (24–45)	12–79	12–84	0.88	6 (4.5)	0 (0)
PROMIS-PI	4–12 (CAT)	100	56 (51–62)	39–75	39–84	–	16 (12)	0 (0)
PSEQ	10	100	51 (36–59)	4–60	0-60	0.92	0 (0)	27 (20)

* Range of scores patients per questionnaire; ^†possible range of scores per questionnaire; ^‡represents the internal consistency; IQR = interquartile range; CAT = computerized adaptive testing; PCS = Pain Catastrophizing Scale; PIPS = Psychological Inflexibility in Pain Scale; PROMIS-PI = Patient-Reported Outcomes Measurement Information System-Pain Interference; PSEQ = Pain Self-Efficacy Questionnaire.