condition mean min max ZT0-3 17.155974999999998 13.195350000000001 21.1166 ZT4-7 9.30884 9.30884 9.30884 ZT8-11 14.147849999999998 14.147849999999998 14.147849999999998 ZT12-15 0 0 0 ZT16-19 20.7217 20.7217 20.7217 ZT20-23 16.48415 16.48415 16.48415