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. 2019 Sep 24;9(9):e029577. doi: 10.1136/bmjopen-2019-029577

Table 3.

Scale descriptive statistics: range, mean, SD, floor and ceiling effects and Cronbach’s alpha coefficient

Subscale Items Mean SD Missing (%)* Obs. range Floor %† Ceiling %† Cronbach’s alpha
Temporariness 2 2.3 0.7 0.0 0–4 0.5 1.0 −0.08
Wages 3 1.6 0.8 3.1 0–4 4.2 0.7 0.69
Disempowerment 2 2.1 1.0 0.0 0–4 9.2 1.4 0.50
Vulnerability 5 1.4 1.0 1.0 0–4 11.7 1.9 0.89
Rights 5 2.3 1.2 1.2 0–4 2.9 18.0 0.78
Exercise of rights 6 1.6 0.9 1.2 0–4 6.8 1.0 0.88
EPRES-Se 23 1.9 0.5 3.4 0.09–3.07 0.2 0.2 0.83

*Proportion of participants with any missing item.

†Proportion of participants with lowest (floor) and highest (ceiling) EPRES-Se scores.