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Table 2

Tumor initiation ratesa(counts) by zone and quadrants

Foveal zone was considered as directionless, and its initiation rate was 21.43 ca/1000ua.

Concentric zoneQuadrantsbOverall rates (counts)P              c
STITSNIN
Parafoveal 16.53 (25) 22.49 (34) 7.94 (12) 9.92 (14) 14.22 (85) 0.006 
Posterior 13.48 (32) 12.22 (29) 10.11 (23) 12.64 (32) 12.11 (116) 0.751 
Peripheral 8.90 (26) 7.87 (23) 8.56 (25) 10.27 (32) 8.90 (106) 0.801 
Anterior 4.64 (17) 4.64 (17) 4.10 (15) 4.10 (15) 4.51 (64) 0.981 
Ciliary 3.87 (9) 4.74 (11) 3.01 (7) 5.60 (13) 4.30 (40) 0.572 
P              d <0.001 <0.001 0.011 0.004 <0.001  
Concentric zoneQuadrantsbOverall rates (counts)P              c
STITSNIN
Parafoveal 16.53 (25) 22.49 (34) 7.94 (12) 9.92 (14) 14.22 (85) 0.006 
Posterior 13.48 (32) 12.22 (29) 10.11 (23) 12.64 (32) 12.11 (116) 0.751 
Peripheral 8.90 (26) 7.87 (23) 8.56 (25) 10.27 (32) 8.90 (106) 0.801 
Anterior 4.64 (17) 4.64 (17) 4.10 (15) 4.10 (15) 4.51 (64) 0.981 
Ciliary 3.87 (9) 4.74 (11) 3.01 (7) 5.60 (13) 4.30 (40) 0.572 
P              d <0.001 <0.001 0.011 0.004 <0.001  

Tumor counts, per spherical area, per 1000 eyes.

S, superior; I, inferior; T,temporal; N, nasal.

χ2 tests for differences by quadrants.

χ2 tests for differences by zone.

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