Subcategorisation within the multiple reasons category, and the subsequent risks of development/detection of high grade CIN, considered in conjunction with related single reason categories
| Category | Number in category (A) | % Of total inadequate smears (of 1972) | No. of high grade CIN at colposcopy and histology | % Of high grade CIN at colposcopy and histology within each category | No. lost to follow up (B) | No. of inadequates corrected for non-responders (A−B) | Number (%) high grade CIN at colposcopy and histology within each category corrected for lost to follow up |
|---|---|---|---|---|---|---|---|
| CIN, cervical intraepithelial neoplasia. | |||||||
| Multiple reasons | 305 | 15.47 | 8 | 2.62 | 28 | 277 | 8 (2.89%) |
| Multiple reasons, including obscured by polymorphs | 168 | 8.52 | 5 | 2.98 | 14 | 154 | 5 (3.25%) |
| Obscured by polymorphs (single reason) | 290 | 14.71 | 6 | 2.07 | 21 | 269 | 6 (2.23%) |
| Multiple reasons (including obscured by polymorphs) and single reason category obscured by polymorphs combined | 458 | 23.23 | 11 | 2.40 | 35 | 423 | 11 (2.60%) |
| Multiple reasons (including obscured by blood) | 105 | 5.32 | 1 | 0.95 | 10 | 95 | 1 (1.05%) |
| Obscured by blood (single reason category) | 265 | 13.44 | 6 | 2.26 | 21 | 244 | 6 (2.46%) |
| Obscured by blood (single reason category) and multiple reasons (including obscured by blood) | 370 | 18.76 | 7 | 1.89 | 31 | 339 | 7 (2.06%) |
| Multiple reasons (with polymorphs or blood) (single reason) obscured by blood − (single reason) obscured by polymorphs combined | 764 | 38.74 | 17 | 2.23 | 60 | 704 | 17 (2.41%) |