Table 3.

Interrater differences, reliability and agreement

	Observer A mean (SD)	Observer B mean (SD)	Interobserver difference mean (SD)	Intraclass correlation coefficient (CI)	Agreement (%)		Limits of agreement	SDD*
					±1 TP all men women	±3 TP all men women
Day 1	7.23 (4.61)	7.10 (4.73)	−0.13 (2.30)	0.77 (0.58 to 0.97)	59	85	−4.64; 4.72	5
					67	95
					50	72
Day 2	7.08 (4.95)	7.41 (5.78)	0.33 (2.08)	0.84 (0.70 to 0.99)	56	87	−3.83; 4.50	5
					57	90
					56	83

Reliability estimated by the intraclass correlation coefficient.

*Smallest detectable difference.

SDD, smallest detectable difference; TP, tender points.