Table 3

Testability rates with different optotypes

Study	0ptotype	n		Testability
		3 yo	total	3 yo	total
		4 yo	total	4 yo	total
Present study	Single-crowded tumbling E	929	1735	91.90%	94.9%
Present study	Single-crowded tumbling E	806	1735	98.30%	94.9%
Leone et al 24	HOTV-ATS	363	723	86.5%	91.4%
Leone et al 24	HOTV-ATS	360	723	96.3%	91.4%
Pan et al 3	HOTV-ATS	460	1027	81%	90.5%
Pan et al 3	HOTV-ATS	567	1027	98%	90.5%
Kvarnstrom et al 27	HOTV chart	478	707	84.80%	87.4%
Kvarnstrom et al 27	HOTV chart	229	707	92.80%	87.4%
Kvarnstrom et al 27	LEA chart	478	707	82.80%	86.1%
Kvarnstrom et al 27	LEA chart	229	707	92.90%	86.1%
Kupl et al 23	HOTV-ATS	225	858	(3–3.5 yo not included)	97.6% (5yo included)
Kupl et al 23	HOTV-ATS	633	858	96.70%	97.6% (5yo included)
Becker et al 12 Paediatric routine examination	Single LEA symbols	71	134	76.00%	85.00%
Becker et al 12 Paediatric routine examination	Single LEA symbols	63	134	95.00%	85.00%
Becker et al 12 Ophthalmic revaluation	Single LEA symbols	10	28	80.00%	92.80%
Becker et al 12 Ophthalmic revaluation	Single LEA symbols	18	28	100.00%	92.80%

For a more accurate comparison, testability rates are presented separately at 3 and 4 yo.
yo, years old.