Table 3. Genetic differentiation among samples at microsatellite loci as determined by χ² exact tests.

		Samples a
Samples		31	34	35	36	37	39	42	43	44	45	46	47	48
	34	++
	35	++	-
	36	++	++	++
	37	++	+	0	++
	39	++	0	0	+	-
	42	++	+	++	++	++	-
	43	++	+	++	++	++	-	++
	44	++	+	++	++	++	0	++	0
	45	++	+	++	++	++	0	+	-	0
	46	++	+	++	++	++	-	++	+	+	0
	47	++	-	+	++	+	0	+	+	-	0	-
	48	++	-	+	++	+	0	+	+	-	0	-	0
	49	++	+	+	++	++	0	+	+	-	-	+	0	-

^a Sample 31 came from a hotel. Samples 34–49 came from the same apartment building.

“++” denotes two highly differentiated sample collections at a p-value < 10⁻⁷; “+” denotes two sample collections differentiated at a p-value < 0.01; “-”denotes two sample collections that are not significantly differentiated at a p-value > 0.01; and “0” denotes two identical populations at a p-value > 0.1.