condition mean min max ZT0-3 3.7876255 1.2226065 5.07223 ZT4-7 1.2698550000000002 1.2698550000000002 1.2698550000000002 ZT8-11 1.600181 1.600181 1.600181 ZT12-15 3.0788725 2.26286 3.894885 ZT16-19 4.60017 4.60017 4.60017 ZT20-23 6.70244 6.70244 6.70244