18 February 2024: Clinical Research
Vertical Relationship Ratio (VRR): A High Reliability and Accuracy Radiographic Measurement for Basilar Invagination in Rheumatoid Arthritis
Monchai Ruangchainikom 1ABDEF , Ekkapoj Korwutthikulrangsri 1E , Apisit Rattanatanasarn 1C , Ishthayapong Kanjanakeereewong 1C , Win Boonsirikamchai 2C , Panlop Tirawanish 3C , Surin Thanapipatsiri 1A , Werasak Sutipornpalangkul 1ADE*DOI: 10.12659/MSM.943329
Med Sci Monit 2024; 30:e943329
Table 2 Intra- and inter-observer reliability of different measurements in each group of patients.
| Intra-observer reliability | Inter-observer reliability | ||||
|---|---|---|---|---|---|
| Rater 1 | Rater 2 | ||||
| Mean±SD | ICC (95% CI) | Mean±SD | ICC (95% CI) | ||
| Median (range) | Median (range) | ||||
| Vertical relationship ratio | |||||
| Non-RA | 2.17±0.11 | 0.96 (0.91, 0.98) | 2.15±0.12 | 0.92 (0.84, 0.96) | 0.86 (0.75–0.93) |
| 2.16 (2.03–2.37) | 2.11 (2.01–2.36) | ||||
| RA with BI | 1.78±0.22 | 0.97 (0.94, 0.99) | 1.80 ±0.24 | 0.96 (0.91, 0.98) | 0.97 (0.93, 0.98) |
| 1.81 (1.16–2.16) | 1.84 (1.19–2.17) | ||||
| RA without BI | 2.20±0.11 | 0.98 (0.95, 0.99) | 2.23 ±0.14 | 0.91 (0.84,0.96) | 0.89 (0.80, 0.95) |
| 2.22 (2.03–2.53) | 2.24 (2.01–2.59) | ||||
| Ranawat method | |||||
| Non-RA | 17.57±1.63 | 0.60 (0.34, 0.78) | 17.61±2.35 | 0.68 (0.46–0.83) | 0.80 (0.63–0.89) |
| 17.46 (14.85–20.69) | 17.32 (13.79–26.46) | ||||
| RA with BI | 12.35±3.98 | 0.89 (0.78, 0.95) | 11.97 ±4.09 | 0.96 (0.91, 0.98) | 0.91 (0.82, 0.96) |
| 12.25 (4.30–20.59) | 11.69 (2.74–23.36) | ||||
| RA without BI | 16.57±2.06 | 0.88 (0.78, 0.94) | 16.51 ±2.05 | 0.80 (0.64, 0.89) | 0.92 (0.85, 0.96) |
| 17.00 (10.32–20.16) | 16.95 (10.34–21.46) | ||||
| Modified Ranawat method | |||||
| Non-RA | 35.37±2.59 | 0.79 (0.63, 0.89) | 34.37±2.51 | 0.78 (0.60, 0.88) | 0.86 (0.74, 0.93) |
| 34.62 (30.68–41.39) | 34.03 (30.09–40.23) | ||||
| RA with BI | 27.87±4.82 | 0.98 (0.97, 0.99) | 27.50±4.79 | 0.97 (0.95, 0.99) | 0.98 (0.96, 0.99) |
| 27.72 (18.17–38.94) | 26.90 (17.99–40.97) | ||||
| RA without BI | 32.86±2.77 | 0.97 (93, 0.98) | 32.50±2.65 | 0.97 (0.94, 0.99) | 0.96 (0.92, 0.98) |
| 33.30 (26.59–40.41) | 33.03 (26.19–40.22) | ||||
| Redlund-Johnell line | |||||
| Non-RA | 41.85±5.72 | 0.96 (0.93, 0.98) | 41.97±5.74 | 0.99 (0.98, 0.99) | 0.98 (0.96, 0.99) |
| 41.72 (32.06–52.41) | 41.75 (32.67–53.64) | ||||
| RA with BI | 34.57±6.09 | 0.98 (0.96, 0.99) | 34.02±5.90 | 0.99 (0.99, 0.99) | 0.92 (0.84, 0.96) |
| 35.31 (18.94–46.48) | 33.54 (20.17–45.47) | ||||
| RA without BI | 39.35 ±5.73 | 0.98 (0.96, 0.99) | 39.25 ±5.69 | 0.98 (0.96, 0.98) | 0.97 (0.94, 0.98) |
| 40.17 (25.83–50.24) | 39.82 (28.22–49.51) | ||||
| ICC – intraclass correlation coefficient; Non-RA – non-rheumatoid arthritis patients; RA with BI – Rheumatoid arthritis patients with basilar invagination; RA without BI – rheumatoid arthritis patients without basilar invagination. Statistical analysis by using intraclass coefficient (ICC) scores with 95% confidence intervals. | |||||