Table 3 Multivariable Cox proportional hazards model for the relationship between calibrated energy intake and daily step count on all-cause mortality

EI/steps quartile, n

1037

1041

1038

1043

 Calibrated EI (kcal/day)

2149

(273)

2174

(284)

2166

(284)

2198

(281)

 Step counts (steps/day)

7391

(2174)

4497

(764)

3074

(520)

1830

(479)

 EI/steps (kcal/100 steps)

30.7

(6.5)

48.9

(5.2)

71.3

(7.9)

128.8

(41.2)

 z-score

1.28

(1.41)

0.21

(1.14)

-0.46

(1.11)

-1.03

(1.18)

 No of deaths/PY

11

(3553)

9

(3538)

31

(3501)

60

(3454)

 Rate/1000 PY (95% CI)

3.1

(1.7 to 5.6)

2.5

(1.3 to 4.9)

8.9

(6.2 to 12.6)

17.4

(13.5 to 22.4)

 Model 1^a

0.47

(0.24 to 0.91)

0.32

(0.16 to 0.66)

0.83

(0.53 to 1.29)

1.00

(Ref)

 Model 2^b

0.51

(0.26 to 1.01)

0.33

(0.16 to 0.67)

0.82

(0.52 to 1.29)

1.00

(Ref)

z-score quartile, n

1043

1038

1040

1038

 Calibrated EI (kcal/day)

1999

(245)

2140

(247)

2219

(244)

2330

(277)

 Step counts (steps/day)

2434

(1081)

3265

(1301)

4291

(1504)

6796

(2664)

 EI/steps (kcal/100 steps)

99.8

(48.6)

78.6

(39.8)

60.3

(30.1)

41.2

(23.3)

 z-score

-1.80

(0.63)

-0.51

(0.26)

0.38

(0.27)

1.94

(0.96)

 No of deaths (PY)

68

(3447)

27

(3518)

12

(3527)

4

(3553)

 Rate/1000 PY (95% CI)

19.7

(15.6 to 25.0)

7.7

(5.3 to 11.2)

3.4

(1.9 to 6.0)

1.1

(0.4 to 3.0)

 Model 1^a

1.00

(Ref)

0.85

(0.53 to 1.35)

0.57

(0.30 to 1.10)

0.25

(0.09 to 0.74)

 Model 2^b

1.00

(Ref)

0.85

(0.53 to 1.39)

0.59

(0.30 to 1.17)

0.25

(0.08 to 0.75)