condition mean min max ZT0-3 11.634374 11.634374 11.634374 ZT4-7 11.879856499999999 11.879856499999999 11.879856499999999 ZT8-11 12.3361005 12.3361005 12.3361005 ZT12-15 14.020693 14.020693 14.020693 ZT16-19 11.632041999999998 11.632041999999998 11.632041999999998 ZT20-23 13.451455 13.451455 13.451455