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Table 1 Baseline characteristics of the overall preoperative TKA cohort, and stratified by area-level socioeconomic status (SES)

From: Association between socioeconomic status and pain, function and pain catastrophizing at presentation for total knee arthroplasty

Characteristics Overall cohort SES 1 SES 2 SES 3 p-value*
  N = 316 N = 85 N = 87 N = 144  
Age – mean (SD) 65.9 (8.7) Median: 65.8 63.2 (8.0) 65.6 (9.8) 67.6 (8.1) <0.01
Sex: Female – n (%) 186 (59) 52 (61) 50 (57) 84 (58) 0.89
Race: Caucasian – n (%) 278 (88) 65 (76) 78 (90) 135 (94) <0.01
BMI – mean (SD) 30.5 (6.3) Median: 29.6 32.5 (6.9) 31.0 (6.5) 28.9 (5.4) <0.01
Current smokers – n (%) 24 (8) 10 (12) 2 (2) 12 (8) 0.04
Educational attainment – n (%)      0.01
Less than college 53 (17) 22 (26) 15 (17) 16 (11)  
Some college 65 (21) 20 (24) 22 (26) 23 (16)  
College graduates 195 (62) 43 (51) 49 (57) 103 (73)  
Mental Health Index Score – mean (SD) 76.2 (17.2) Median: 80 73.6 (18.0) 74.8 (17.8) 78.5 (16.2) 0.06
  1. *P-values compare SES groups with Kruskal-Wallis test for continuous and Fisher’s Exact test for categorical variables; SES 1 is the lowest area-level SES quartiles, SES 3 is the highest two quartiles combined.