condition mean min max ZT0-3 20.4699 20.4699 20.4699 ZT4-7 17.8091 17.8091 17.8091 ZT8-11 14.46335 14.46335 14.46335 ZT12-15 12.53245 12.53245 12.53245 ZT16-19 15.553550000000001 15.553550000000001 15.553550000000001 ZT20-23 16.758899999999997 16.758899999999997 16.758899999999997