condition mean min max ZT0-3 21.382550000000002 21.382550000000002 21.382550000000002 ZT4-7 26.473799999999997 26.473799999999997 26.473799999999997 ZT8-11 38.1632 38.1632 38.1632 ZT12-15 43.749399999999994 43.749399999999994 43.749399999999994 ZT16-19 27.9603 27.9603 27.9603 ZT20-23 23.195700000000002 23.195700000000002 23.195700000000002