Table 4

Performance of SILS at a threshold of 2 (N = 999)*

Characteristic

Impairedand Inadequate Reading Ability (S-TOFHLA < 16)

Impairedand Limited Reading Ability (S-TOFHLA < 23)


Sensitivity (%)

67 (58, 76)

54 (47, 61)

Specificity (%)

82 (80, 85)

83 (81, 86)

Positive Predictive Power

0.31 (0.25, 0.37)

0.40 (0.34, 0.47)

Negative Predictive Power

0.96 (0.94, 0.97)

0.90 (0.88, 0.92)

Likelihood Ratio Positive (LR +)

3.79 (3.12, 4.6)

3.28 (2.67, 4.03)

Likelihood Ratio Negative (LR -)

0.40 (0.30, 0.53)

0.55 (0.47, 0.65)

Area under the ROC curve

0.78 (0.73,0.83)

0.73 (0.69, 0.78)


**Main analysis is based on S-TOFHLA < 23.

Impaired = Low vision or physically unable to complete the S-TOFHLA.

Results are point estimates and 95% confidence intervals.

Morris et al. BMC Family Practice 2006 7:21   doi:10.1186/1471-2296-7-21

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