condition mean min max ZT0-3 139.225567 139.225567 139.225567 ZT4-7 267.5746995 267.5746995 267.5746995 ZT8-11 218.734761 218.734761 218.734761 ZT12-15 187.048905 187.048905 187.048905 ZT16-19 152.548001 152.548001 152.548001 ZT20-23 125.779076 125.779076 125.779076