Resilience and pain catastrophizing among patients with total knee arthroplasty: a cohort study to examine psychological constructs as predictors of post-operative outcomes

Table 1 Population description (N = 117)

Variable	N (%)	Median (Q1, Q3)
Age, years		67.0 (59.0, 72.0)
Female sex	62 (53.0)
White race	81 (70.1)
Hispanic or Latino ethnicity^a	1 (0.9)
Private insurance	51 (43.6)
Married or living as married	83 (70.9)
Employed in or out of the home	46 (39.3)
4-Year college or higher	67 (57.3)
BMI, kg/m²		33.1 (29.0, 37.7)
ASA class
1	2 (1.7)
2	67 (57.3)
3	48 (41.0)
4–6	0 (0)
Primary surgery	106 (90.6)
Contralateral knee TKA	37 (31.6)
Osteoarthritis etiology	113 (96.6)
History of depression	36 (30.8)
History of anxiety	22 (18.8)
Smoking status
Never smoker	74 (63.25)
Former smoker	37 (31.62)
Current smoker	6 (5.13)
Pack years^b		16.3 (6.0, 23.5)
History of diabetes	37 (31.6)
History of hypertension	72 (61.5)
History of cardiovascular disease	21 (17.9)
History of back pain	68 (58.1)
History of low back pain	56 (47.9)
Pain rating		5.0 (3.0, 7.0)
BRS		4.0 (3.5, 4.3)
PCS		13 (5.0, 21.0)
KOOS IS		47.5 (39.6, 59.4)
PROMIS PH		39.8 (34.9, 44.9)
PROMIS MH		50.8 (45.8, 56.0)
PROMIS overall health rating		3.0 (3.0, 4.0)
PROMIS social activity rating		3.0 (2.0, 4.0)

Continuous variables are presented using the median (25th, 75th percentiles) and categorical data are displayed using counts with percentages for non-missing data unless otherwise noted
BMI body mass index, ASA Class American Society of Anesthesiologists physical status classification system, BRS Brief Resilience Score, PCS Pain Catastrophizing Scale, Pain Rating pain intensity on a 0–10-point scale, KOOS IS KOOS interval score, PROMIS PH PROMIS Global Physical Health T-score, PROMIS MH PROMIS Global Mental Health T-score, PROMIS Overall Health Rating raw response score from item 1 on PROMIS Global Health scale, PROMIS Social Activity Rating raw response score from remaining item 9 on PROMIS Global Health scale
^aHispanic or Latino Ethnicity was not included in further analyses due to low representation
^bPack years not available for every patient. N = 32

ISSN: 1477-7525