condition mean min max ZT0-3 8.94837 8.50219 9.394549999999999 ZT4-7 6.150735 6.150735 6.150735 ZT8-11 11.8933 11.8933 11.8933 ZT12-15 0 0 0 ZT16-19 11.091000000000001 11.091000000000001 11.091000000000001 ZT20-23 8.74912 8.74912 8.74912