condition mean min max ZT0-3 5.214878333333333 4.660755 6.005015 ZT4-7 4.34767 4.34767 4.34767 ZT8-11 4.28284 4.28284 4.28284 ZT12-15 5.4132425 5.3368649999999995 5.48962 ZT16-19 5.381975 5.381975 5.381975 ZT20-23 5.804779999999999 5.804779999999999 5.804779999999999