Table 2 Association of physical activity and daily sitting time with the frailty index (FI)

 Light

235

0.17 ± 0.09

0(Ref.)

0(Ref.)

 Moderate

922

0.13 ± 0.07

−0.033(−0.044,-0.022)

< 0.0001

−0.024(−0.035,-0.013)

< 0.0001

 Vigorous

301

0.12 ± 0.06

−0.050(− 0.063,-0.037)

< 0.0001

−0.034(−0.047,-0.021)

< 0.0001

MET-h/day

−0.0033(− 0.0042,-0.0023)

< 0.0001

− 0.0021(− 0.0030,-0.0012)

< 0.0001

P value for trend

< 0.0001

< 0.0001

  <  4 h/day

583

0.12 ± 0.06

0(Ref.)

0(Ref.)

 4–6 h/day

467

0.14 ± 0.07

0.017 (0.007,0.026)

< 0.0001

0.013 (0.003,0.022)

0.007

 6–8 h/day

272

0.14 ± 0.08

0.014 (0.002,0.025)

< 0.0001

0.011 (0.001,0.022)

0.039

  ≥ 8 h/day

136

0.16 ± 0.09

0.039 (0.024,0.053)

< 0.0001

0.034 (0.020,0.048)

< 0.0001

Per h increased

0.0038 (0.0020,0.0055)

< 0.0001

0.0034 (0.0017,0.0051)

0.000

P value for trend

< 0.0001

< 0.0001