condition mean min max ZT0-3 1.677845 1.677845 1.677845 ZT4-7 1.54455 1.54455 1.54455 ZT8-11 1.198015 1.198015 1.198015 ZT12-15 1.2361914999999999 1.2361914999999999 1.2361914999999999 ZT16-19 1.79779 1.79779 1.79779 ZT20-23 1.5723449999999999 1.5723449999999999 1.5723449999999999