Study Bach et al. (1991): study US 1989

Public:

Duchenne Muscular Dystrophy patients and controls, USA, 1985

Sample:

Respondents:

N = 335

Non Response:

Assessment:

Questionnaire: paper
Mailed questionnaire

Correlate

Authors's label

Tracheostomic ventilation

Our Classification

Operationalization

0. Non-invasive method of ventilary support
1. Tracheostomy ventilation

Observed Relation with Happiness