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Table 2 Power calculation secondary outcomes

From: The Prevention Of WEight Regain in diabetes type 2 (POWER) study: the effectiveness of adding a combined psychological intervention to a very low calorie diet, design and pilot data of a randomized controlled trial

Secondary outcome:

SD:

Detectable difference:(n = 104, β=0.8 α=0.05)

Waist circumference

11

2.75 cm

Blood pressure sys/dias

20/20

5/5 mmHg

Total cholesterol

1.4

0.35 mmol/l

LDL cholesterol

1.0

0.25 mmol/l

HDL cholesterol

0.7

0.2 mmol/l

Triglyceride

3.0

0.75 mmol/l

HbA1c

12

3 mmol/mol

Insulin

50

12.5 IU

Depression (HADS score 0–21)

3

0.75

Anxiety (HADS score 0–21)

4

1.0

Self esteem (RSE score 10–40)

5

1.25

Fatigue (CIS score 8–56)

13

3.25

Concentration (CIS score 5–35)

8.5

2.1

Motivation (CIS score 4–28)

6

1.5

Activity (CIS score 3–21)

5

1.25

Quality of life (EuroQol 5D score 1–3)

0.5

0.125

Quality of life (EuroQol VAS 1–100)

21

5.25