condition mean min max ZT0-3 63.699999999999996 63.699999999999996 63.699999999999996 ZT4-7 168.5 168.5 168.5 ZT8-11 99.55 99.55 99.55 ZT12-15 83.15 83.15 83.15 ZT16-19 64.3 64.3 64.3 ZT20-23 15.55 15.55 15.55