Table 1

Summary statistics of variables used in analyses.

reproductive successno. of children bornno. of children diedmortality ratevoice pitch
menM=3.00; s.d.=2.58; N=51M=4.8; s.d.=3.76; N=52M=1.92; s.d.=1.96; N=51M=0.450; s.d.=0.287; N=44M=115.76; s.d.=19.75; N=53
womenM=2.42; s.d.=1.97; N=52M=3.56; s.d.=2.49; N=52M=0.962; s.d.=1.15; N=52M=0.273; s.d.=0.322; N=49M=209.71; s.d.=36.76; N=54