Table II.
Fisher Information Content Ranking in the Unidimensional Integrated Item Response Theory Model
| Item | Item subscore category | % of total Fisher information | Cumulative % total |
|---|---|---|---|
| Quality of Life score | – | 17 | 17 |
| IPSS1 | Voiding | 15.4 | 32.4 |
| IPSS2 | Storage | 12.4 | 44.8 |
| BIIsummary | – | 12.4 | 57.2 |
| IPSS3 | Voiding | 11.9 | 69.1 |
| IPSS5 | Voiding | 10.7 | 79.8 |
| IPSS4 | Storage | 9.7 | 89.5 |
| IPSS6 | Voiding | 6.8 | 96.3 |
| IPSS7 | Storage | 3.7 | 100 |
IPSS, International Prostate Symptom Score; BIIsummary, Benign Prostatic Hyperplasia Impact Index sum of scores; IPSS1, incomplete emptying; IPSS2, frequency; IPSS3, intermittency; IPSS4, urgency; IPSS5, weak stream; IPSS6, straining; IPSS7, nocturia