Table 3.

SF-36 values in SIJ cohort compared to NHMS normals

SF-36 subdomain	Mean (95% CI)*
	NHMS	SIJ cohort
PF	84.9 (83.8–86)	23.4 (21.2–25.7)
RP	81.1 (80–82.3)	21.9 (19.3–24.5)
BP	72.9 (71.7–74.1)	21.0 (19.3–22.7)
GH	71.0 (69.9–72.2)	59.6 (56.7–62.4)
VT	65.7 (64.8–66.7)	30.7 (28.1–33.3)
SF	87.4 (86.4–88.4)	35.7 (32.7–38.8)
RE	90.5 (89.6–91.4)	42.2 (38.0–46.4)
MH	82.6 (81.8–83.3)	55.1 (52.1–58.0)

Notes:

^*Calculated with SAS PROC ANSSURVEYMEANS (SAS Institute Inc., Cary, NC, USA); SF-36 subdomains include PF, RP, BP, GH, MH, RE, SF, and VT.

Abbreviations: SF-36, Short Form-36; NHMS, National Health Measurement Study; CI, confidence interval; SIJ, sacroiliac joint; PF, physical function; RP, role physical; BP, bodily pain; GH, general health; VT, vitality; SF, social function; RE, role emotional; MH, mental health.