Table 1.
Cross-Classification of Right and Left Eyes for RW-ROP
| Right Eye RW-ROP | |||
|---|---|---|---|
| A. Data from table 7 of the publication by Ying et al.1 | |||
| Left Eye RW-ROP | No | Yes | Total |
| No | 772 (65.4%) | 44 (3.7%) | 816 (69.1%) |
| Yes | 55 (4.7%) | 309 (26.2% | 364 (30.8%) |
| Total | 827 (70.1%) | 353 (29.9%) | 1180 (100%) |
| B. Data if right and left eyes are independently affected by RW-ROP | |||
| No | 572 (48.5%) | 244 (20.7%) | 816 (69.1%) |
| Yes | 255 (21.6%) | 109 (9.2%) | 364 (30.8%) |
| Total | 827 (70.1%) | 353 (29.9%) | 1180 (100%) |
Difference in percentage of right and left eyes with RW-ROP = 0.9%.
95% CI (–0.7%, 2.6%), calculated using the Wilson score method.
Test for equality of proportions:
Large sample test: χ12 = 1.22, P = 0.27.
Exact binomial test, P = 0.31.
Percent agreement is 65.4% + 26.2% = 91.6%.
95% CI is (89.9%, 93.1%), calculated using the exact method.
95% CI is (90.0%, 93.2%), calculated using the normal approximation method.
95% CI is (89.9%, 93.1%), calculated using the Wilson score statistic method, no continuity adjustment.
κ is (91.6%–57.7%)/(1–57.7%) = 0.80.
95% CI is (0.76, 0.84).
Percent agreement is 48.5% + 9.2% = 57.7%.