condition mean min max ZT0-3 52.3125 51.391099999999994 53.2339 ZT4-7 73.17564999999999 73.17564999999999 73.17564999999999 ZT8-11 73.53055 73.53055 73.53055 ZT12-15 0 0 0 ZT16-19 50.899249999999995 50.899249999999995 50.899249999999995 ZT20-23 50.2652 50.2652 50.2652