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Table 1 The baseline characteristics of the original full data set and those of the study sample

From: Searching for the optimal measuring frequency in longitudinal studies -- an example utilizing short message service (SMS) to collect repeated measures among patients with low back pain

Variable Original study N = 244 This study N = 129
Age, median (IQR) 43 (35–53) 46 (36–54)
Gender, % female 48 50
Pain, VAS, 1–10, median (IQR) 4.0 (3–6) 4.0 (3–6)
Leg pain, % 49.3 47.2
Duration of LBP > 30 days % 58.4 55.0
Health-related quality of life:
 EQ-5D mean (SD) 0.715 (0.21) 0.734 (0.20)
 General Health median (IQR) 2 (2–3) 2 (2–3)