condition mean min max ZT0-3 10.321132 10.321132 10.321132 ZT4-7 10.5792915 10.5792915 10.5792915 ZT8-11 10.3781785 10.3781785 10.3781785 ZT12-15 9.0295065 9.0295065 9.0295065 ZT16-19 10.394294 10.394294 10.394294 ZT20-23 10.498591000000001 10.498591000000001 10.498591000000001