condition mean min max ZT0-3 0.9873999999999999 0.9873999999999999 0.9873999999999999 ZT4-7 0.6368995 0.6368995 0.6368995 ZT8-11 1.6960600000000001 1.6960600000000001 1.6960600000000001 ZT12-15 4.41713 4.41713 4.41713 ZT16-19 4.07103 4.07103 4.07103 ZT20-23 1.4316066666666667 1.4316066666666667 1.4316066666666667