condition mean min max ZT0-3 6.31671157425 4.1197198205 8.513703328 ZT4-7 5.550445999 4.4151834255 6.685708572499999 ZT8-11 8.980611437 6.998247807 10.962975067 ZT12-15 8.243036854500001 7.373223125500001 9.1128505835 ZT16-19 5.4140971024999995 5.079055482999999 5.749138722 ZT20-23 5.47295633275 5.2445167955 5.701395870000001