condition mean min max ZT0-3 37.11751666666667 23.14095 46.97875 ZT4-7 24.28215 24.28215 24.28215 ZT8-11 20.1318 20.1318 20.1318 ZT12-15 18.537425 15.69695 21.377899999999997 ZT16-19 13.7836 13.7836 13.7836 ZT20-23 42.4969 42.4969 42.4969