. Author manuscript; available in PMC: 2013 Aug 10.

Published in final edited form as: Optom Vis Sci. 2010 Mar;87(3):168–175. doi: 10.1097/OPX.0b013e3181d1d954

TABLE 1.

Distribution of alternate cover test measurements

	Mean (Δ)	Median (Δ)	Range	Percentage between 2Δ BO and 2Δ BI
Narrow theoretical distribution	0	0		95.0
Inexperienced examiners shown the narrow distribution when using the long protocol	2.9 BI	2 BI	22 BI–15 BO	40.8
Inexperienced examiners shown the narrow distribution when using the short protocol	2.5 BI	Ortho	22 BI–17 BO	47.1^a

Wide theoretical distribution	0	1 BO		53.0
Inexperienced examiners shown the wide distribution when using the long protocol	3.1 BI	2 BI	22 BI–15 BO	42.9
Inexperienced examiners shown the wide distribution when using the short protocol	2.6 BI	Ortho	17 BI–17 BO	52.1^a

Experienced examiner
Using the long protocol	3.2 BI	3 BI	27.5 BI–17.5 BO	33.3
Using the short protocol	2.7 BI	2 BI	27.5 BI–17.5 BO	45.8^a

Significantly more deviations between 2Δ BO and 2Δ BI were measured with the short dissociation protocol for all examiner groups (p < 0.001).