condition mean min max ZT0-3 1218.205458 1218.205458 1218.205458 ZT4-7 1038.833466 1038.833466 1038.833466 ZT8-11 895.760608 895.760608 895.760608 ZT12-15 1090.6126015 1090.6126015 1090.6126015 ZT16-19 968.1799000000001 968.1799000000001 968.1799000000001 ZT20-23 702.4516854999999 702.4516854999999 702.4516854999999