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Table 2 Frequency and degree scores and Cronbach’s alpha in each subscale, and summary scores of the DEQS-Th

From: Thai version of the dry eye-related quality-of-life score questionnaire: preliminary assessment for psychometric properties

Subscale and summary score

Median score (range)

Cronbach’s alpha

Frequency

Degree

Frequency

Degree

Bothersome Ocular Symptoms subscale

2.0 (0–6)

4.0 (0–19)

0.80

0.70

Impact on Daily Life subscale

3.0 (0–9)

2.0 (0–9)

0.89

0.89

Summary score

5.0 (0–13)

7.0 (0–28)

0.90

0.89