condition mean min max ZT0-3 2960.2 2960.2 2960.2 ZT4-7 4283.8 4283.8 4283.8 ZT8-11 3774.3500000000004 3774.3500000000004 3774.3500000000004 ZT12-15 2970.8500000000004 2970.8500000000004 2970.8500000000004 ZT16-19 2333.25 2333.25 2333.25 ZT20-23 2461.55 2461.55 2461.55