Table 3.

Criterion validity using composite scores of all dimensions of the Ocular Pain Assessment Survey (OPAS).

DIMENSIONS OF THE OPAS – INITIAL VISIT
	Eye pain intensity in the past 24h	Eye pain intensity in the past 2 weeks	QoL	Aggravating factors	Associated symptoms	Non-eye pain intensity
GOLD STD (pain intensity)	0.81	0.57	0.64	0.41	0.33	0.47
P	<0.0001	<0.0001	<0.0001	<0.0001	<0.01	<0.0001
N	102	95	102	94	92	102
DIMENSIONS OF THE OPAS – FOLLOW-UP VISIT
GOLD STD (pain intensity)	0.93	0.68	0.74	0.64	0.33	0.19
P	<0.0001	<0.001	<0.001	<0.01	>0.05	>0.05
N	21	18	21	21	19	21

Composite scores from each of the 6 dimensions of the OPAS were correlated (Spearman’s correlation coefficient, r_s) with scores from the gold standard Wong-Baker FACES Pain Rating Scale (gold std) at initial (n=102) and follow-up visits (n=21). Ocular pain intensity and interference with quality of life (QoL) dimensions showed the strongest correlations, and lower but significant correlations for aggravating factors, associated factors and non-eye pain intensity dimensions. These results confirm both convergent and discriminant validity of the OPAS that was consistent at the follow-up visit as well. A p-value of less than 0.05 was considered statistically significant.