Table 6 Functional classes by Short Physical Performance Battery (SPPB) score and age groups 70–79 years

 1. Velocity [cm/s]

117.4 ± 24.6

133.6 ± 19.0

115.9 ± 19.2

90.8 ± 21.6

115.9 ± 22.5

131.3 ± 16.4

115.1 ± 18.1

92.3 ± 19.4

 2. Stride length [cm]

130.8 ± 21.9

144.1 ± 15.2

130.2 ± 17.3

107.2 ± 22.7

122.3 ± 16.9

132.3 ± 13.4

122.5 ± 13.4

105.3 ± 16.1

 3. Walk ratio^a [cm/(steps/min)]

0.61 ± 0.10

0.65 ± 0.07

0.61 ± 0.09

0.53 ± 0.11

0.54 ± 0.07

0.56 ± 0.06

0.55 ± 0.06

0.50 ± 0.08

 5. Double support time [ms]

312 ± 72

273 ± 46

317 ± 58

375 ± 94

291 ± 66

248 ± 38

291 ± 50

361 ± 75

 8. Stride length CV^b [%]

3.8 ± 2.0

3.1 ± 1.3

3.7 ± 2.1

5.3 ± 2.1

3.6 ± 1.8

3.1 ± 1.6

3.5 ± 1.6

4.6 ± 2.2