Table 3. Pairwise comparison of programmed death ligand 1 scores of the four assays.

Pair of assays	Immune cell score (%)		Tumor cell score (%)
	Mean difference* (SD)	Mixed effects p-value†	Mean difference* (SD)	Mixed effects p-value†
SP142 and SP263	−5.21 (5.47)	< 0.0001	−5.85 (13.73)	< 0.0001
SP142 and 22C3	−6.69 (8.38)	< 0.0001	−4.98 (11.70)	< 0.0001
SP142 and E1L3N	−5.18 (6.89)	< 0.0001	−3.95 (10.24)	< 0.0001
SP263 and 22C3	−1.47 (4.30)	< 0.0001	0.87 (6.36)	0.1950
SP263 and ElL3N	0.03 (2.99)	0.9314	1.90 (4.96)	< 0.0001
22C3 and E1L3N	1.50 (3.84)	0.0001	1.03 (3.24)	< 0.0001

SD = standard deviation.

^*Mean difference of 30 cases assessed by 10 pathologists; ^†mixed-effects linear model (pathologists as random effects) after log-transformation.