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Table 5 Analysis of time, in weeks, from study start to the first occurrence of two consecutive weeks with missing SMS for the Weekly studies. A Cox proportional hazard model was used and the outcome parameter was the Hazard Ratio (HR) and HR = 1.0 indicated no effect

From: Frequently repeated measurements -our experience of collecting data with SMS

Variables in the modelHazard Ratio, HR (95% CI)
p-value
Age ≥ 50 years (reference age < 50 years)0.80 (0.55–1.15)
Sex (reference males)p = 0.234
1.06 (0.74–1.52)
Pain 6–7 (reference pain 0–5)p = 0.747
1.00 (0.77–1.99)
Pain 8–10 (reference pain 0–5)p = 0.981
1.24 (0.77–1.99)
Study Work-Up (reference MC Chiro)p = 0.377
4.65 (2.67–8.09)
Study PARA (reference MC Chiro)p < 0.001
6.17 (3.38–11.28)
p < 0.001