Table 4.

Mean NPC (Near Point of Convergence), PFV (Positive Fusional Vergence), and CI Symptom Survey (CISS) score at study entry for participants in the CITT and CITT-ART studies by accommodative function (both decreased amplitude and facility; one (either) type of dysfunction; neither accommodative dysfunction).

	Accommodative Function (Status of AA and AF)				Decreased AA or AF compared to age-normal accommodation		Decreased AA and AF compared to age-normal accommodation		Decreased AA and AF compared to Decreased AA or AF
Measure	Both AA and AF Decreased (N=127) Mean (SD)	Either AA or AF Decreased (N=237) Mean (SD)	Age-normal accommodation (N=156) Mean (SD)	P Value*	Mean Difference (95% CI)	P Value**	Mean Difference (95% CI)	P Value**	Mean Difference (95% CI)	P Value**
NPC (cm)	17.8 (8.6)	14.6 (7.6)	10.9 (5.9)	<.001	3.6 (2.1,5.1)	<.001	6.9 (5.2,8.7)	<.001	3.3 (1.7,4.9)	<.001
PFV (Δ)	10.1 (4.1)	11.2 (3.8)	12.3 (4.1)	<.001	−1.1 (−1.9,−0.3)	0.03	−2.2 (−3.1,−1.3)	<.001	−1.1 (−2,−0.3)	0.03
CISS Score	31.4 (8.9)	30.2 (8.8)	26.9 (7.9)	<.001	3.3 (1.6,5.1)	<.001	4.5 (2.5,6.5)	<.001	1.2 (−0.7,3)	0.21

^*The p value from an ANOVA testing for mean differences is displayed after the group means.

^**The p values for the group comparisons have been corrected for multiple testing using the Holm–Bonferroni stepdown method.

Decreased accommodative amplitude = more than 2D below the minimum expected amplitude for age (15 - ¼ age); Decreased accommodative facility = less than 6 cycles per minute. Age normal accommodation = Neither AA or AF Decreased