Table 1.

Patient characteristics for groups A (PSC patients) and B (PC patients) (N = 2692)

Characteristics	Group A (PSC Patients) n = 1363	Group B (PC Patients) n = 1329	Chi-square/t-test	p-value
Age (mean)			t =  − 10.45	p < .001
Age in years at index (initial visit)	48	54.5*
Sex (%)			10.06	p = .002
Female	64%*	58%
Race/ethnicity (%)			4.07	p = .91
White/Caucasian	95%	96%
Marital status (%) (n = 2687)
Cohabiting	57.5%	58.3%	0.199	p = .655
Not cohabiting	15.1%	15.1%
Employment status (%)			55.15	p < .001
Employed (FT, PT, self-employed)	66.7%	54.1%
Retired	16.2%	26.9%
Unemployed	10.5%	12.0%
Other (student, unknown)	6.6%	6.9%
Primary diagnosis (pain source) at index date—pain source (%)			1263.12	p < .001
Radicular	7.7%	17.8%
Disc	18.3%	2.6%
Facet or segmental dysfunction	55.8%	4.5%
Myofascial	3.2%	12.6%
Non-specific back pain	14.2%	56.7%
Other	0.9%	5.8%
Charlson Comorbidity Score (mean)	0.63	0.95*	t =  − 5.46	p < .001

Frequencies presented for most common categories. Categories for marital status and employment status were collapsed for ease of analysis. p-values are from Pearson chi-square analyses or t-tests. Mean Charlson score and age based on a t-test. Race/Ethnicity reports Fisher’s Exact probability. Mean age was significantly higher for patients in Group B (PC patient) (p < .001). Frequency of females was significantly higher in Group A (p = .002), and mean Charlson score was significantly higher in Group B (p < .001)