. 2002 Jan;200(1):105–111. doi: 10.1046/j.0021-8782.2001.00006.x

Table 1.

Non-parametric test (Mann–Whitney) of the birefringence (transmittance) and area (µm²) measurements for the dp and sp portions. η₁ and η₂ correspond to the median values. W represents the rank sum (Bhattacharyya & Johnson, 1977) obtained for the sp and dp portions. The test is significant at 0.0001 (adjusted for ties) (Farthofer & Lee, 1995)

	η₁-dp	η₂-sp	η₁ − η₂	W
Areas	92.57	59.09	23	136 229.0
Birefringence	41.23	35.8	6.11	139 156.0