condition mean min max ZT0-3 0.3428045 0.208544 0.477065 ZT4-7 0.8294914999999999 0.8294914999999999 0.8294914999999999 ZT8-11 1.7018250000000001 1.7018250000000001 1.7018250000000001 ZT12-15 0 0 0 ZT16-19 1.372645 1.372645 1.372645 ZT20-23 0.928922 0.928922 0.928922