condition mean min max ZT0-3 30.524925000000003 26.3798 34.67005 ZT4-7 15.00565 15.00565 15.00565 ZT8-11 15.0818 15.0818 15.0818 ZT12-15 0 0 0 ZT16-19 21.194499999999998 21.194499999999998 21.194499999999998 ZT20-23 21.76605 21.76605 21.76605