Table 1: Characteristics of flare patients whose SF was identified as PRG4-deficient and were selected for lubrication testing, and normal (NL) SF from cadaveric donors. * = significantly higher (p < 0.001) compared to normal.

Sample	Age	Sex	Days post injection	Aspirate Volume (mL)	Total Protein (mg/mL)
Flare 1 L	47	M	11	27	37.2
Flare 1 R	47	M	11	32	35.3
Flare 2	53	M	4	55	32.0
Flare 3	48	F	7	60	46.8
Flare 4	47	F	1	22	25.5
Flare Avg	48 (46, 51)			39.2 (24.2, 54.2)*	35.4 (28.5, 42.2)*
NL Avg (N = 29)	55 (51, 59)	6F, 12M		3.6 (2.2, 4.9)	15.4 (13.0, 17.8)

Data are presented as mean with 95% confidence interval (lower limit, upper limit). L = left, R = right, M = male, F = female, Avg = average, NL = normal. * = significantly higher than NL, p < 0.05.