condition mean min max ZT0-3 3.40021441875 3.0203353805 3.780093457 ZT4-7 2.34205969425 1.961716876 2.7224025125 ZT8-11 4.1660021665 3.25601825 5.075986083 ZT12-15 5.2644513275 4.7538228595 5.7750797955 ZT16-19 4.767991878 4.17470159 5.3612821660000005 ZT20-23 8.720891372250001 7.282577869500001 10.159204875