condition mean min max ZT0-3 0.6225261666666666 0.4497565 0.8762224999999999 ZT4-7 0.593878 0.593878 0.593878 ZT8-11 0.35316749999999997 0.35316749999999997 0.35316749999999997 ZT12-15 0.7710515 0.720859 0.8212440000000001 ZT16-19 0.6710665 0.6710665 0.6710665 ZT20-23 0.3785045 0.3785045 0.3785045