condition mean min max ZT0-3 1134.9 1134.9 1134.9 ZT4-7 339.2 339.2 339.2 ZT8-11 646.7 646.7 646.7 ZT12-15 649.5 649.5 649.5 ZT16-19 419.75 419.75 419.75 ZT20-23 1014.3499999999999 1014.3499999999999 1014.3499999999999