Sex differences in number of X chromosomes and X-chromosome inactivation in females promote greater variability in hearing among males

Table 1 Variance ratios plotted in Fig. 3 and probabilities variance ratios = 1.0

Grant et al. data	500 Hz	1 kHz	2 kHz	3 kHz	4 kHz	6 kHz
Left ear VarRatio	1.016	1.220	1.269	1.259	1.245	1.013
prob VarRatio = 1.0	0.420	0.004	0.001	0.001	0.002	0.438
Right ear VarRatio	1.173	1.068	1.096	0.957	1.127	1.014
prob VarRatio = 1.0	0.018	0.192	0.112	0.270	0.057	0.430

NHANES data	500 Hz	1 kHz	2 kHz	3 kHz	4 kHz	6 kHz	8 kHz
Left ear VarRatio	1.082	1.098	1.083	1.036	1.037	1.072	0.997
prob VarRatio = 1.0	0.010	0.003	0.010	0.151	0.145	0.020	0.464
Right Ear VarRatio	1.102	0.999	1.012	1.042	1.020	1.017	1.060
prob VarRatio = 1.0	0.002	0.492	0.361	0.114	0.282	0.306	0.044

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