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Table 4 Results of statistical analysis between younger and older groups

From: The effect of age on sagittal plane profile of the lumbar spine according to standing, supine, and various sitting positions

Measurement factors Young age group Old age group P value* (power of statistical results)†
1. Standing Ф 52.20 ± 7.95 53.90 ± 15.90 0.631
2. Supine Ф 40.16 ± 8.84 49.50 ± 13.12 0.043 (0.54)
3. Sitting Ф (at 30°) 39.25 ± 6.92 46.91 ± 12.63 0.143
4. Sitting Ф (at 60°) 17.30 ± 7.10 35.02 ± 10.26 0.002 (0.99)
5. Sitting Ф (at 90°) 13.52 ± 11.61 27.87 ± 9.15 0.011 (0.89)
  1. *For comparing the mean values between groups, the Mann–Whitney U test was used. The P values under 0.05 was considered to be significant. †The evaluation of power on statistical results. GPower program set up with alpha values as 0.05 was used. The values are in degrees and the mark ‘°’ means the degree. Ф means the lumbar lordotic angle which was measured between the upper end plate of the first lumbar and upper end plate of first sacrum. ULL and LLL mean upper lumbar lordosis and lower lumbar lordosis, respectively.