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Table 3 Risk stratification and predictive values of a RAMA-AS prediction score

From: Developing and validating of Ramathibodi Appendicitis Score (RAMA-AS) for diagnosis of appendicitis in suspected appendicitis patients

Score Risk groups Score development for derivative phase
Outcome % sensitivity
(95% CI)
% specificity
(95% CI)
LR+
(95% CI)
LR-
(95% CI)
Post-positive test odds (%)
AP Non-AP
<− 0.64 Very low 25 85 100.00 0 1.00 0 61.80
− 0.64 to 0.84 Low risk 61 51 89.75
(85.25–93.26)
54.97
(46.67–63.06)
1.98
(1.65–2.37)
0.19
(0.13–0.28)
76.00
(73.00–79.00)
0.85 to 1.74 Moderate 64 12 64.08
(57.73–70.09)
88.08
(81.82–92.78)
5.25
(3.39–8.13)
0.41
(0.34–0.49)
89.00
(85.00–93.00)
> 1.74 High 91 7 37.96
(31.86–44.36)
95.36
(90.68–98.12)
8.36
(3.96–18.00)
0.65
(0.59–0.72)
93.00
(86.00–97.00)
  1. AP appendicitis, LR likelihood ratio