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Table 2 Parameters used for the calculation of the sample size by group

From: Implementation of a multidisciplinary psychoeducational intervention for Parkinson’s disease patients and carers in the community: study protocol

 

Mean (SD)

Quality of life

Size effect. Clinically significant difference

Power

Expected losses over follow-up

Ideal sample size

Patients

29.03 (15.44)a

10

80%

25%

52

Carers

104.70 (25.04)b

15

80%

20%

53

  1. SD: standard deviation
  2. aQuestionnaire on Parkinson’s disease PDQ-39 of Peto et al. (1995) [26]
  3. bScale of Quality of Life of Care-givers SQLC of Glozman et al. (1998) [31]