Age group | Participants | Population (a) | Statistics (b) | ||||
---|---|---|---|---|---|---|---|
 | N | Mean | SD | N | Mean | SD |  |
60-69 years (c) | 27 | 0.26 | 0.28 | 1245 | 0.80 | 0.22 | t = 13.28, df = 326,*** |
70-79 years | 88 | 0.33 | 0.29 | 912 | 0.76 | 0.23 | t = 13.09, df = 349, *** |
80+ years (d) | 93 | 0.30 | 0.26 | 357 | 0.70 | 0.26 | t = 8.98, df = 187,*** |