condition mean min max ZT0-3 31.8348872125 29.74785999 33.921914435 ZT4-7 42.1549886875 37.41472202 46.895255355 ZT8-11 46.54381716 42.46485508 50.62277924 ZT12-15 26.5828489225 17.757588535 35.40810931 ZT16-19 49.0508595525 40.242595449999996 57.859123655 ZT20-23 67.3680800125 57.746313715 76.98984630999999