condition mean min max ZT0-3 11.805043 11.805043 11.805043 ZT4-7 10.1289325 10.1289325 10.1289325 ZT8-11 11.763482499999999 11.763482499999999 11.763482499999999 ZT12-15 10.553101999999999 10.553101999999999 10.553101999999999 ZT16-19 10.8378775 10.8378775 10.8378775 ZT20-23 12.77758 12.77758 12.77758