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Table 2 Changes in intervention effects (differencea) for calcium intake results at 1st and 2nd follow-up at cluster level: unadjusted versus adjusted and with versus without exclusions

From: Efficacy of a workplace osteoporosis prevention intervention: a cluster randomized trial

 

Comparison of intervention effect (difference) using summaries of unadjusted means

Comparison of intervention effect (difference) using summaries of unstandardized residualsc

No exclusion

Exclude 2SD outliersb

Exclude 2SD outliers and adjusted for socioeconomic factorsd

Differencea

95 % CI

p

Differencea

95 % CI

p

Differencea

95 % CI

p

Differencea

95 % CI

p

1st Follow-up

401.15

395.9–406.4

<0.0005

400.2

395.0–405.4

<0.0005

355.5

349.4–361.7

<0.0005

343.2

337.4–349.0

<0.0005

2nd Follow-up

366.7

360.6–372.8

<0.0005

368.8

363.0–374.6

<0.0005

317.0

311.1–322.8

<0.0005

290.5

285.3–295.7

<0.0005

  1. aDifference = difference between mean baseline and follow up measures
  2. b12 cases at 1st follow-up and 14 cases at second follow-up
  3. cAdjusted for baseline values; dPersonal income, education and religion