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Table 2 Physical activity data measured objectively using the GT3X Actigraph and subjectively using the Global Physical Activity Questionnaire (GPAQ) (mean ± SD)

From: Levels of self-reported and objective physical activity in individuals with age-related macular degeneration

Variables AMD subjects with vision loss (n = 11) AMD subjects without vision loss
(n = 10)
Controls with normal vision (n = 11) ANOVA
p-value
Actigraph
 Total wear time (min/day) 838 (75) 873 (61) 880 (62) 0.298
 Number of valid wear days 6.9 (0.3) 6.8 (0.4) 6.9 (0.3) 0.710
 Sedentary behaviour (min/day) 462 (64) 443 (52) 424 (94) 0.482
 Light-intensity activity (min/day) 224 (73) 285 (81) 241 (32) 0.103
 MVPA (min/day) 143 (40)* 145 (36)* 216 (87) 0.011
 Step count (steps/day) 6218 (3159) 5199 (2529) 8258 (4931) 0.173
GPAQ
 Sedentary behaviour (min/day) 234 (113) 323 (126) 264 (102) N/A
 MVPA (min/day) 102 (78) 127 (92) 92 (50) N/A
Bias1 Actigraph vs. GPAQ
 Sedentary behaviour (min/day) 228 (118) 119 (106) 160 (132) 0.127
 MVPA (min/day) 40 (93)* 18 (117)* 124 (86) 0.048
  1. MVPA, moderate-to-vigorous physical activity; N/A, not applicable; 1, difference score between the objective and subjective measure of physical activity; *, significantly different from controls with normal vision (p < 0.05)
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