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Table 2 Comparison of participant characteristics in subsequent study phases: Those participating in the home interview only (n = 108) versus those taking part also in the subsequent physical assessments at the research center (n = 910); and those participating in the research center (n = 415) versus those also participating in the accelerometry-based physical activity assessments (n = 496)

From: Assessing physical performance and physical activity in large population-based aging studies: home-based assessments or visits to the research center?

 Home interview onlyResearch visit Research visit onlyAccelerometry 
 % (n) / Mean ± SD% (n) / Mean ± SDP% (n) / Mean ± SD% (n) / Mean ± SDP
Age (75 years)21.3 (23)47.7 (434)<.001 a44.3 (184)50.5 (250).062 a
 (80 years)38.9 (42)32.1 (292) 32.3 (134)31.9 (158) 
 (85 years)39.8 (43)20.2 (184) 23.4 (97)17.6 (87) 
Sex (Female)60.2 (65)56.9 (518).586 a53.5 (222)59.8 (296).065 a
Living situation (Alone)51.4 (55)40.0 (364).031 a44.3 (184)36.5 (180).019 a
Perceived financial status (Good-excellent)58.3 (60)60.5 (546).820 a57.5 (237)62.9 (309).123 a
Self-rated health (Good-excellent)30.2 (32)47.4 (431).001 a44.8 (186)49.5 (245).180 a
No limitations due to health & function20.0 (21)42.1 (383)<.001 a41.9 (174)42.2 (209).982 a
No ADL limitations77.3 (75)88.5 (791).003 a86.1 (346)90.4 (445).053 a
No walking difficulty 500 m57.6 (57)79.8 (714)<.001 a77.1 (314)82.0 (400).089 a
Mobility device (Yes)43.0 (43)21.5 (194)<.001 a24.1 (99)19.3 (95).096 a
Physical activity level (Low PA < 3 h)61.9 (60)44.8 (401).002 a49.0 (199)41.3 (202).025 a
Neighborhood mobility (Daily)46.1 (47)62.2 (565).002 a62.8 (260)61.7 (305).795 a
Season (Winter)17.6 (19)22.2 (202).305 a20.0 (83)24.0 (119).058 a
 (Spring)28.7 (31)21.2 (193) 24.3 (101)18.6 (92) 
 (Summer)34.3 (37)35.1 (319) 32.5 (135)37.2 (184) 
 (Autumn)19.4 (21)21.5 (196) 23.1 (96)20.2 (100) 
Body Mass Index (Normal or underweight)28.0 (116)30.1 (149).524 a
MMSE score25.9 ± 3.027.3 ± 2.5<.001 c27.1 ± 2.527.4 ± 2.4.082 c
CES-D score9.5 ± 7.48.5 ± 7.1.198 c9.5 ± 7.57.8 ± 6.6<.001 c
Years of education (years)10.5 ± 3.911.7 ± 4.7.025 c11.8 ± 5.111.6 ± 4.3.956 c
Max handgrip strength (N)262.4 ± 93.8310.3 ± 103.1<.001 b303.0 ± 96.9316.4 ± 107.7.051 b
Walking speed SPPB (m/s)0.8 ± 0.31.0 ± 0.3<.001 b0.9 ± 0.31.0 ± 0.3.018 b
Self-reported physical activity of at least moderate intensity (min/day)30.4 ± 23.141.9 ± 27.6<.001 c39.5 ± 27.143.9 ± 27.9.006 c
Self-reported upright posture (min/day)303.6 ± 162.9352.0 ± 148.6<.001 c336.8 ± 144.1364.7 ± 151.3.004 c
  1. ADL Activities of Daily Living, PA Physical Activity, MMSE Mini-Mental State Examination, CES-D Center for Epidemiologic Studies for Depression
  2. a Chi-square test, b Independent T-test, c Mann-Whitney U test