condition mean min max ZT0-3 34.9999728225 33.16237991 36.837565735 ZT4-7 9.27987216925 5.7258281555 12.833916183 ZT8-11 8.220102115749999 4.7821220234999995 11.658082208 ZT12-15 22.5456015925 15.41177253 29.679430654999997 ZT16-19 17.073180360000002 15.01544552 19.1309152 ZT20-23 30.924842375 29.50274625 32.3469385