Table 5.

Performance of fixation grading

	Overall (n = 61) %	Eso (n = 36) %	Exo (n = 25) %	4-9 years (n = 28) %	10-16 years (n = 33) %	Anisometropia ≤1D (n = 41)%	Anisometropia >1D (n = 20)%
Sensitivity	93	95	89	100	85	95	100
Specificity	78	69	88	78	77	85	69
Positive predictive value	79	79	80	71	85	87	64
Negative predictive value	93	92	93	100	77	94	100
Prevalence	47	55	36	35	60	51	35

Eso: Esodeviation, Exo: Exodeviation, D: Diopter