Table 4.

Sensitivity and specificity of the LEPTO dipstick assay in the acute phase of disease for groups of serum samples stratified according to the duration of the disease

Country% Sensitivity (95% confidence interval) for stagea:% Specificity (95% confidence interval) for stagea:
IIIIII
Barbados81.0 (65–91)97.6 (86–100)98.9 (93–100)95.3 (83–99)
Hawaii50.0 (34–66)77.1 (59–89)92.3 (87–96)89.0 (81–94)
India81.1 (64–91)69.2 (38–90)99.0 (94–100)99.9 (94–100)
New Zealand40.9 (21–63)90.0 (67–92)88.1 (80–93)84.5 (74–79)
Puerto Rico85.7 (42–99)100.0 (31–100)97.1 (91–99)92.3 (62–100)
Russia65.2 (43–83)100.0 (85–100)87.0 (65–97)84.0 (63–95)
Seychelles35.1 (25–47)77.8 (66–86)93.0 (80–98)96.8 (82–100)
Thailand40.4 (18–67)80.0 (51–95)96.4 (91–99)97.7 (87–100)
The Netherlands62.5 (26–90)95.2 (74–99)93.2 (83–98)97.1 (92–95)
Mean (SD)60.1 (17.0)87.4 (10.9)94.1 (4.4)92.7 (5.8)
  • a See the text for explanations of stages.