Comparing the diagnostic accuracy of modified RIPASA and MASS in patients diagnosed with acute appendicitis in Suez Canal University Hospital Emergency Department: a cross-sectional study

Table 7 Diagnostic predictive values of modified RIPASA and MASS for appendicitis against histopathological diagnosis

Variables	Histopathological diagnosis		Diagnostic predictive values
Variables	Appendicitis (n = 34)	Not Appendicitis (n = 6)	sensitivity	specificity	PPV	NPV	Accuracy
RIPASA
appendicitis	24 (70.6%)	0 (0%)	70.6%	100%	100%	37.5%
Not appendicitis	10 (29.4%)	6 (100%)	70.6%	100%	100%	37.5%	75%
MASS
appendicitis	16 (47.1)	4 (66.7)	47.1%	33.3%	80%	10%
Not appendicitis	18 (52.9)	2 (33.3)	47.1%	33.3%	80%	10%	45%

PPV Positive predictive value
NPV Negative predictive value
Table 7 shows validity testing of modified RIPASA and MASS for appendicitis against the gold standard culture test. The best cut-off score to diagnose acute appendicitis in our sample based on modified RIPASA was fixed at 8.5, where the sensitivity of the modified RIPASA testing reached 70.6%, with specificity of 100%, positive predictive value of 100%, and negative predictive value of 37.5% and 75% accuracy.
Whereas for MASS, the best cut-off score to diagnose acute appendicitis in our sample was fixed at 5.5, where the sensitivity of the MASS reached 47.1%, with specificity of 33.3%, positive predictive value of 80%, negative predictive value of 10% and accuracy 45%

ISSN: 1471-227X