Parameter | Mean | CI 95 % | Distribution | Source | |
---|---|---|---|---|---|
p5 | p95 | ||||
Women tested (annual count) | 723,829 | 583,056 | 869,393 | Normal | NHLS database |
Presence of endocervical cells broom vs spatula, odds ratio | 1.57 | 1.44 | 1.70 | Normal | [7] |
Probability of detection of atypia/dyskaryosis in smears with enodcervical cells vs those without, odds ratio | 1.89 | 1.80 | 1.98 | Normal | [7] |
Probability of detection of severe atypia/dyskaryosis in smears with enodcervical cells vs those without, odds ratio | 2.46 | 1.75 | 3.17 | Normal | [7] |
HIV-infected (%) | 51 | 40 | 64 | Binomial | NHLS database |
HIV-infected women tested (annual count) | 372,340 | 261,707 | 493,988 | Normal | Calculated |
Abnormal Pap smear (% of all smears) | 73 | 71 | 75 | Binomial | [9] |
HSIL (% of all smears) | 31 | 29 | 33 | Binomial | [9] |
LSIL (% of all smears) | 37 | 35 | 39 | Binomial | [9] |
ASC-US (% of all smears) | 5 | 4 | 6 | Binomial | [9] |
Endocervical cells present, spatula (% of all smears) | 53 | 52 | 54 | Binomial | NHLS database |
Endocervical cells present, broom (% of all smears) | 83 | 76 | 90 | Binomial | Calculated |
Sensitivity (%, if endocervical cells present) | 76 | 72 | 80 | Binomial | [9] |
Sensitivity (%, if no endocervical cells present) | 40 | 35 | 45 | Binomial | Calculated |
Sensitivity HSIL (%, if no endocervical cells present) | 32 | 23 | 44 | Binomial | Calculated |
Repeat Pap smear done (% of patients) | 90 | 85 | 95 | Binomial | Assumption |
Smear satisfactory for evaluation (% of all smears) | 98 | 98 | 99 | Binomial | NHLS database |
Specificity (%) | 84 | 81 | 87 | Binomial | [9] |
Lost to follow-up (% of patients) | 8 | 6 | 10 | Binomial | [10] |