condition mean min max ZT0-3 2.838365 2.7683400000000002 2.90839 ZT4-7 2.415565 2.415565 2.415565 ZT8-11 2.6830049999999996 2.6830049999999996 2.6830049999999996 ZT12-15 0 0 0 ZT16-19 3.07083 3.07083 3.07083 ZT20-23 5.2951049999999995 5.2951049999999995 5.2951049999999995