condition mean min max ZT0-3 3.6422325 3.616395 3.66807 ZT4-7 3.99627 3.99627 3.99627 ZT8-11 3.92995 3.92995 3.92995 ZT12-15 0 0 0 ZT16-19 5.07016 5.07016 5.07016 ZT20-23 5.152520000000001 5.152520000000001 5.152520000000001