condition mean min max ZT0-3 35.949999999999996 35.949999999999996 35.949999999999996 ZT4-7 53.1 53.1 53.1 ZT8-11 31.25 31.25 31.25 ZT12-15 39.2 39.2 39.2 ZT16-19 45.95 45.95 45.95 ZT20-23 50.55 50.55 50.55