Table 5

Stomach index scores based on seven biopsies for a series of hypothetical profiles^a

Biopsies with preneoplastic findings	Stomach index score
Unaffected	0.00
One mild IM^b
One moderate atrophy
One moderate IM	0.50
One severe atrophy
One severe IM
Two mild IM	1.15
Two moderate atrophy	1.41
Two moderate IM	1.55
One moderate atrophy/one mild IM	1.82
One mild IM/one moderate IM	1.91
Six mild IM	2.00
Two severe atrophy	2.00
Four moderate atrophy	2.00
Two severe IM	2.00
Five moderate IM	2.45
Three severe IM	2.45
One moderate atrophy/two moderate IM	2.55
Seven moderate atrophy	2.65
Four severe atrophy	2.83
One mild IM/one moderate IM/one severe IM	3.33
Two severe atrophy/two moderate IM	3.55
Three moderate atrophy/three moderate IM	3.63
Seven severe IM	3.74
Seven severe atrophy	3.74
Seven severe atrophy/seven severe IM	7.48
One moderate dysplasia	10.00
Two moderate dysplasia	14.14
Seven severe atrophy/seven severe IM/seven moderate dysplasia	33.94

a If a single biopsy of seven total was affected with moderate or severe atrophy or IM of any degree, then score Y_i = 0.5. Otherwise, Y_i = [(1.00 ∗ (n_{moderate ATROi})^0.5 + 1.4142 ∗ (n_{severe ATRO})^0.5] + 2.70 ∗ [(0.3024 ∗ (n_{mild IMi})^0.5 + 0.4057 ∗ (n_{moderate IMi})^0.5 + 0.5238 ∗ (n_{severe IMi})^0.5] + 10.00 ∗ (1.00 ∗ n_{moderate DYSPi})^0.5], where n is the number of biopsies with each condition.
b IM, intestinal metaplasia.