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Table 2 PRIMEtime CE risk factors directly related to disease, exposure parameters, outcomes, and modelled uncertainty distributions. Adapted and updated from Cobiac et al.[32] Dietary relative risks adjusted for energy intake where possible

From: PRIMEtime CE: a multistate life table model for estimating the cost-effectiveness of interventions affecting diet and physical activity

Risk factors

Parameter

Exposure parameters

Outcomes

Unit of change

Distribution of uncertainty range

Relative risk (SE)

Notes

 Fruit

Mean (SD) g/day for consumers and % consuming < 1 fruit portion daily from the National Diet and Nutrition Survey (NDNS) [49]. Theoretical ideal: 300 (30) g/day [50]

CHD [51]

Per 106 g/day fruit

Lognormal

0.93 (0.019)

 

Stroke [52]

Per 106 g/day fruit

Lognormal

0.89 (0.023)

 

Lung cancer [53]

Per 100 g/day fruit

Lognormal

0.94 (0.02)

 

 Vegetables

Mean (SD) g/day for consumers and % consuming < 1 vegetable portion daily from NDNS [49]. Theoretical ideal: 400 (30) g/day [50]

CHD [51]

Per 106 g/day vegetables

Lognormal

0.89 (0.034)

 

Lung cancer [53]

Per 100 g/day vegetables

Lognormal

0.94 (0.025)

 

 Fibre (cereal only)

Mean (SD) g/day from NDNS [49]

CHD [54]

Per 10 g/day fibre (cereal)

Lognormal

0.91 (0.02)

Cereals only to avoid double counting for fruit and vegetables

 Fibre

Mean (SD) g/day from NDNS [49]. Theoretical ideal: 30 (3) g/ day [50]

Breast cancer [55]

Per 10 g/day fibre

Lognormal

0.93 (0.027)

 

Colorectal cancer [56]

Per 10 g/day fibre

Lognormal

0.90 (0.034)

 

Stomach cancer [57]

Per 10 g/day fibre

Lognormal

0.56 (0.12)

 

 Red meat intake

Mean (SD) g/day from NDNS [49]. Theoretical ideal: 100 (10) g/ week [50]

Colorectal cancer [58]

Per 100 g/day red meat

Lognormal

1.30 (0.06)

 

Stomach cancer [59]

Per 100 g/day red meat

Lognormal

1.13 (0.036)

 

Type two diabetes [60]

Per 100 g/day red meat

Lognormal

1.20 (0.072)

 

 Processed meat intake

Mean (SD) g/day from NDNS [49]. Theoretical ideal: 0 g/day [50]

Colorectal cancer [58]

Per 50 g/day processed meat

Lognormal

1.38 (0.07)

 

Type two diabetes [60]

Per 50 g/day processed meat

Lognormal

1.57 (0.1)

 

 Serum cholesterol

Mean (SD) mmol/L from NDNS [49]. Theoretical ideal: 3.8 (0.6) mmol/L [61]

CHD [62]

Per -1 mmol/l total cholesterol

Lognormal

< 49 years: 0.44 (0.034)

50–59 years: 0.58 (0.034)

60–69 years: 0.72 (0.018)

70–79 years: 0.82 (0.015)

80+ years: 0.85 (0.21)

 

Stroke [62]

Per -1 mmol/l total cholesterol

Lognormal

< 59 years: 0.90 (0.037)

60–69 years: 1.02 (0.027)

70–79 years: 1.04 (0.025)

80+ years: 1.06 (0.031)

 

 Systolic blood pressure

Mean (SD) mmHg from NDNS [49]. Theoretical ideal: 115 (6) mmHg [61]

CHD [63]

Per -20 mmHg systolic blood pressure

Lognormal

< 49 years: 0.49 (0.042)

50–59 years: 0.50 (0.015)

60–69 years: 0.54 (0.0094)

70–79 years: 0.60 (0.013)

80+ years: 0.67 (0.023)

 

Stroke [63]

Per -20 mmHg systolic blood pressure

Lognormal

< 49 years: 0.36 (0.057)

50–59 years: 0.38 (0.034)

60–69 years: 0.43 (0.024)

70–79 years: 0.50 (0.02)

80+ years: 0.67 (0.03)

 

 Body mass index

Mean (SD) kg/m2 from NDNS [49]. Theoretical ideal: 21 (1) kg/m2 [61]

CHD [64]

Per 5 kg/m2 BMI

Lognormal

35–59 years: 1.50 (0.039)

60–69 years: 1.40 (0.031)

70–79 years: 1.31 (0.033)

80–89 years: 1.30 (0.055)

 

Stroke [64]

Per 5 kg/m2 BMI

Lognormal

35–59 years: 1.76 (0.075)

60–69 years: 1.49 (0.056)

70–79 years: 1.33 (0.056)

80–89 years: 1.10 (0.083)

 

Diabetes [64]

Per 5 kg/m2 BMI

Lognormal

BMI 15–25: 0.96 (0.25)

BMI 25–50: 2.16 (0.067)

 

Pancreas cancer [65]

Per 5 kg/m2 BMI

Lognormal

1.10 (0.016)

 

Colorectal cancer [64]

Per 5 kg/m2 BMI

Lognormal

Men: 1.24 (0.016)

Women: 1.09 (0.019)

 

Breast cancer [64]

Per 5 kg/m2 BMI

Lognormal

Women 60+ years: 1.12 (0.018)

 

Kidney cancer [64]

Per 5 kg/m2 BMI

Lognormal

Men: 1.24 (0.039)

Women: 1.34 (0.034)

 

Liver cancer [64]

Per 5 kg/m2 BMI

Lognormal

1.47 (0.078)

 

Liver cirrhosis [64]

Per 5 kg/m2 BMI

Lognormal

BMI 15–25: 0.73 (0.016)

BMI 25–50: 1.79 (0.077)

 

 Diabetes

Prevalence

CHD [66]

If have diabetes compared to no diabetes

Lognormal

Men: 1.85 (0.063)

Women: 2.63 (0.076)

 

Stroke [67]

If have diabetes compared to no diabetes

Lognormal

Men: 1.83 (0.067)

Women: 2.28 (0.085)

 

 Physical activity

Mean (SD) MET hours per week from Active People’s Survey [68]

CHD [69]

11.25METhr/wk. increase

Normal

−0.204 (0.027)

Parameter is the beta value of the 0.25 transformation of the relative risk, unadjusted for BMI.

Stroke [69]

11.25METhr/wk. increase

Normal

−0.195 (0.041)

Parameter is the beta value of the 0.25 transformation of the relative risk, unadjusted for BMI.

Diabetes [69]

11.25METhr/wk. increase

Normal

−0.240 (0.023)

Parameter is the beta value of the 0.25 transformation of the relative risk, unadjusted for BMI.

Colorectal cancer [70]

11.25METhr/wk. increase

Normal

−0.080 (0.059)

Parameter is the beta value of the 0.25 transformation of the relative risk, unadjusted for BMI.

Breast cancer [70]

11.25METhr/wk. increase

Normal

−0.053 (0.023)

Parameter is the beta value of the 0.25 transformation of the relative risk, unadjusted for BMI.

  1. SD standard deviation, NDNS National Diet and Nutrition Survey, CHD coronary heart disease, BMI body mass index, MET Metabolic Equivalent of Task