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Table 2 Hypothesized effect sizes and measures of variability

From: A comparative effectiveness study of two culturally competent models of diabetes self-management programming for Latinos from low-income households

Outcomes

Measures

Method/Instrument

Hypothesisa

Hypothesized

Change score, ΔDSCS-CCM (SD)

Hypothesized

Cohen’s f effect size

Power

Primary Outcome: Improved Capacity for Diabetes Self-Management

Diabetes Knowledge

DKQ summed score

The CCM Model will result in a larger increase in DKQ summed scores

2.2 (3.8)

(references [2123])

0.09

96%

Patient Activation

PAM-13 raw score

The CCM model will result in a larger increase in PAM-13 raw scores

12.7 (24.8)

(references [24,25,26,27,28,29,30,31,32, 44])

0.07

85%

Secondary Outcome: Successful Diabetes Self-Management

A1c

% A1c

The CCM model will result in a larger decrease in percent A1c

−0.5 (1.0)

(references [45,46,47,48])

0.06

84%b

BMI

BMI

The CCM model will result in a larger decrease in BMI

−1.5 (3) kg/m2

(references [47, 49])

0.06

84%b

Depression

PHQ-9 summed score

The CCM model will result in a larger decrease in PHQ-9 summed scores

−3 (6)

(references [5052])

0.06

84%b

Exploratory Outcome: Improved Stress Management

Hair Cortisol

Cortisol amount (pg/mg)

The CCM model will result in greater decrease in average cortisol levels

4 (6)

(references [38,39,40, 5358])

0.05

95%

  1. aChanges over time are from baseline to 6 months
  2. bIt is coincidental that the power (and effect sizes) are the same for each of the three secondary outcomes
  3. BMI body mass index
  4. DKQ diabetes knowledge questionnaire
  5. PAM-13 patient activation measure 13-item instrument
  6. PHQ-9 patient health questionnaire 9-item instrument
  7. Pg/mg picogram of cortisol per milligram of hair