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Table 5 Reliability values and paired sample t tests for intra-day and inter-day measurements.

From: The effects of the Mulligan Sustained Natural Apophyseal Glide (SNAG) mobilisation in the lumbar flexion range of asymptomatic subjects as measured by the Zebris CMS20 3-D motion analysis system

Measurement ICC(1,1) SEM SDD 95% CI (Lower-Upper) p value (t test) Mean
Intra-day (measured on Day 1) 0.89 3.3° 13.8% 0.79 – 0.95 0.60 67.4°
Intra-day (measured on Day 8) 0.90 3.0° 12.1% 0.77 – 0.96 0.35 68.5°
Inter-day (between the different days' measurements) 0.82 4.0° 16.3% 0.61 – 0.92 0.28 68.3°
  1. ICC: intraclass correlation coefficient; SEM: standard error of measurement; SDD: smallest detectable difference (expressed as percentage of grand mean).