condition mean min max ZT0-3 11.708235 11.708235 11.708235 ZT4-7 13.2342575 13.2342575 13.2342575 ZT8-11 12.3848305 12.3848305 12.3848305 ZT12-15 12.487487 12.487487 12.487487 ZT16-19 13.255875 13.255875 13.255875 ZT20-23 12.357078999999999 12.357078999999999 12.357078999999999