Table 4

Sex differences in CT density changes (n = 56)


Men (n = 29)
Women (n = 27)
p value

Upper Zone
-0.6
-2.2
p = 0.006
Perc15 (HU)
(-2.11 to 0.8)
(-5.2 to -0.7)

Upper Zone
0.17
0.46
p < 0.03
VI -950HU (%)
(-0.27 to 0.70)
(0.15 to 1.08)

Lower Zone
0.23
-1.89
p < 0.05
Perc15 (HU)
(-1.68 to 1.71)
(-5.67 to 0.03)

Lower Zone
0.12
0.24
not significant
VI -950HU (%)
(-0.17 to 0.57)
(0.04 to 0.79)


The data was not normally distributed and therefore is presented as median with interquartile range in parentheses. All values are presented as a standardized annual rate of change.

VI = voxel index, Perc15 = 15th percentile point, HU = Hounsfield Units

Parr et al. Respiratory Research 2006 7:136   doi:10.1186/1465-9921-7-136

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