Table 3.

The mean age and SDs (in years) for patients visiting independent and multiple optical practices.

	Under 16s	16s–59s	Over 60s
Independents	9.2 ± 3.6	39.0 ± 15.4	73.9 ± 8.4
Multiple	9.6 ± 3.3	39.4 ± 14.6	71.9 ± 7.9