condition mean min max ZT0-3 12.1101925 10.201135 14.01925 ZT4-7 14.6133 14.6133 14.6133 ZT8-11 10.618514999999999 10.618514999999999 10.618514999999999 ZT12-15 0 0 0 ZT16-19 11.465235 11.465235 11.465235 ZT20-23 16.101399999999998 16.101399999999998 16.101399999999998