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Table 1 Overview of outcome measures

From: The cameroon mobile phone sms (CAMPS) trial: a protocol for a randomized controlled trial of mobile phone text messaging versus usual care for improving adherence to highly active anti-retroviral therapy

Outcome measures

Scale

Type

Measure

Analysis method

Primary

    

Adherence at 6 months*

    

   VAS

Ordinal

Binary

VAS percentage >95%

Chi-squared test

   Self report

Ordinal

Binary

% adherence in last month > 95%

Chi-squared test

   PRD

Ordinal

Binary

% of complete refills >95%

Chi-squared test

Secondary

    

   Weight

Ratio

Continuous

Change in weight

T-test

   BMI

Ratio

Continuous

Change in BMI

T-test

   OI

Nominal

Binary

Occurrence of new OI

Chi-squared test

   Mortality

Nominal

Binary

All deaths

Chi-squared test

   Retention

Nominal

Binary

Number retained in care

Chi-squared test

   CD4 count

Ratio

Continuous

Change in CD4 count

T-test

   Viral load

Ratio

Continuous

Change in viral load

T-test

   Satisfaction with care

Ordinal

Categorical

Change in satisfaction scores

T-test

   QoL

Ordinal

Categorical

Change in QoL scores

T-test

  1. VAS: visual analogue scale, PRD: pharmacy refill data, BMI, body mass index, OI: opportunistic infection, CD4: Cluster Designation 4, QoL: Quality of Life.
  2. * All three measures of adherence will also be analyzed as continuous outcomes using T-test