condition mean min max ZT0-3 3.50651 2.78486 4.22816 ZT4-7 3.46291 3.46291 3.46291 ZT8-11 4.6438950000000006 4.6438950000000006 4.6438950000000006 ZT12-15 0 0 0 ZT16-19 4.033925 4.033925 4.033925 ZT20-23 7.47414 7.47414 7.47414