Table 3.

Test performance of IgA tTG in predicting marsh 3 histology at repeat biopsy

Group	N	Se	Sp	PPV	NPV	Accuracy
Overall	71	0.43	0.68	0.25	0.83	0.63
Symptomatic at repeat biopsy
Yes	49	0.25	0.73	0.15	0.83	0.65
No	22	0.67	0.56	0.36	0.82	0.59
Months on GFD
<24	30	0.20	0.52	0.08	0.76	0.47
≥24	41	0.56	0.81	0.45	0.87	0.76

^*Repeat serology was only included if it was measured within 4 months of the date of repeat endoscopy (N=71).