condition mean min max ZT0-3 1.60472114675 1.290625505 1.9188167885 ZT4-7 3.4502163725 2.029279287 4.871153458 ZT8-11 70.86964953325 41.8542572415 99.88504182499999 ZT12-15 329.16747377499996 319.43763005 338.8973175 ZT16-19 269.74097205 255.40187795000003 284.08006615 ZT20-23 203.9052526 188.61201045 219.19849475