condition mean min max ZT0-3 1017.8499999999999 1017.8499999999999 1017.8499999999999 ZT4-7 1235.8 1235.8 1235.8 ZT8-11 1230.3 1230.3 1230.3 ZT12-15 1076.0 1076.0 1076.0 ZT16-19 839.3 839.3 839.3 ZT20-23 949.1999999999999 949.1999999999999 949.1999999999999