condition mean min max ZT0-3 43.72925 43.72925 43.72925 ZT4-7 53.8565 53.8565 53.8565 ZT8-11 24.821649999999998 24.821649999999998 24.821649999999998 ZT12-15 14.774550000000001 14.774550000000001 14.774550000000001 ZT16-19 22.649549999999998 22.649549999999998 22.649549999999998 ZT20-23 23.079700000000003 23.079700000000003 23.079700000000003