Table 9.

Area suppression index

	C1	C2	C3	C4	C5	C6
C1		5.0a	7.1a	6.4a	5.1a	4.3a
0.38 ± 0.22
C2	p < 0.025a		1.3	1.2	1.0	1.1
0.14 ± 0.18
C3	p < 0.025a	p = 0.73		1.0	1.2	1.3
0.11 ± 0.24
C4	p < 0.005a	p = 0.78	p = 0.96		1.2	1.2
0.12 ± 0.22
C5	p < 0.025a	p = 0.99	p = 0.80	p = 0.83		1.1
0.14 ± 0.16
C6	p < 0.05a	p = 0.92	p = 0.77	p = 0.79	p = 0.95
0.14 ± 0.25

The values in the first column under the cluster number show the mean ± SD for each cluster. The p values were determined using Student's t test. For 5 of 85 cells in the 6 main clusters, we did not obtain area summation measures. The n in each cluster C1-C6 was 15, 20, 18, 13, 7, and 7, respectively.

^aValues reached significance level <0.05.