Table 1. Volumes (mm3) of brain sectors, GW ratios, and statistical comparisons of deaf and hearing subjects (effect sizes, t test P value, and univariate ANOVA P value)
Effect t test ANOVA
Sector Tissue Deaf mean (SD) Hearing mean (SD) Mean difference (95% CI) size P value P value*
Left temporal lobe GM 76,061 (8,933) 73,714 (10,041) 2,347 (-3,057-7,752) 0.25 ns na
WM 40,808 (5,760) 39,714 (6,660) 1,094 (-2,447-4,635) 0.18 ns na
Total 116,869 (14,261) 113,427 (16,328) 3,441 (-5,276-12,159) 0.23 ns na
GW ratio 1.87 (0.13) 1.87 (0.12) 0.01 (-0.07-0.08) 0.05 ns na
Right temporal lobe GM 76,186 (9,170) 73,716 (11,000) 2,470 (-3,289-8,228) 0.24 ns na
WM 40,911 (6,292) 39,996 (7,681) 915 (-3,078-4,908) 0.13 ns na
Total 117,097 (15,165) 113,712 (18,278) 3,384 (-6,166-12,935) 0.20 ns na
GW ratio 1.87 (0.12) 1.86 (0.15) 0.01 (-0.07-0.09) 0.08 ns na
Left STG GM 16,011 (2,835) 16,099 (3,599) -88 (-1,930-1,755) 0.03 ns ns
WM 5,493 (1,056) 6,020 (1,417) -527 (-1,237-183) 0.42 ns 0.001
Total 21,504 (3,765) 20,588 (4,426) -615 (-3,109-1,879) 0.14 ns 0.039
GW ratio 2.95 (0.33) 2.69 (0.25) 0.26 (0.9-0.43) 0.82 0.003 0.003
Right STG GM 15,227 (2,838) 13,811 (2,987) 1,416 (-241-3,072) 0.48 ns ns
WM 6,809 (1,538) 6,777 (1,498) 429 (-832-895) 0.02 ns ns
Total 22,035 (4,279) 20,588 (4,426) 1,447 (-1,029-3,923) 0.33 ns ns
GW ratio 2.27 (0.23) 2.04 (0.15) 0.22 (0.11-0.33) 1.01 0.000 0.000
Left HG GM 1,901 (561) 1,724 (398) 177 (-99-454) 0.36 ns ns
WM 554 (180) 640 (193) -86 (-192-20) 0.45 ns 0.029
Total 2,455 (722) 2,364 (565) 91 (-277-460) 0.14 ns ns
GW ratio 3.50 (0.56) 2.78 (0.52) 0.71 (0.41-1.02) 1.11 0.000 0.000
Right HG GM 1,597 (381) 1,485 (420) 113 (-116-341) 0.28 ns ns
WM 542 (164) 636 (168) -93 (47--188) 0.54 0.053 0.012
Total 2,140 (519) 2,120 (565) 19 (-289-328) 0.04 ns ns
GW ratio 3.05 (0.56) 2.35 (0.41) 0.69 (0.41-0.97) 1.15 0.000 0.000
Left PT GM 3,479 (1,197) 3,059 (1,083) 421 (-228-1,070) 0.37 ns ns
Right PT GM 2,816 (754) 2,336 (748) 480 (53-907) 0.61 0.028 0.023
Left STG-minus-HG GM 14,110 (2,464) 14,375 (3,410) -265 (-1,957-1,427) 0.09 ns ns
WM 4,939 (988) 5,380 (1,337) -441 (-1,110-227) 0.37 ns 0.005
Total 19,049 (3,324) 19,755 (4,660) -706 (-3,008-1,595) 0.18 ns 0.032
GW ratio 2.90 (0.36) 2.69 (0.26) 0.21 (.03-.39) 0.65 0.020 0.021
Right STG-minus-HG GM 13,629 (2,622) 12,326 (2,714) 1,303 (-215-2,820) 0.48 ns ns
WM 6,266 (1,450) 6,142 (1,387) 125 (-682-932) 0.09 ns ns
Total 19,895 (3,979) 18,468 (4,048) 1,428 (-855-3,710) 0.35 ns ns
GW ratio 2.21 (0.22) 2.01 (0.15) 0.19 (0.08-0.30) 0.90 0.001 0.000
  • CI, confidence interval; ns, not significant; na, not applicable.

  • * Univariate analysis of variance, with temporal lobe volume (gray, white, or total, as appropriate) as covariable.