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Table 2 Sample size calculations.

From: Walking behaviour and glycemic control in type 2 diabetes: seasonal and gender differences-Study design and methods

Outcome measure

Winter-summer difference

Standard deviation

Reference

Desired accuracy (95% CI width)

Required sample size

A1C

0.207%

0.943%

See Table 1

± 0.1

342

± 0.15

152

Steps/day

Men

3,629

Estimate: 5,000

Chan et al [20] (data)

± 500

384

± 1,000

96

± 1,100

80

Women

1,106

Estimate: 5,000

Chan et al [20] (data)

± 500

384

± 1,000

96

± 1,100

80