condition mean min max ZT0-3 12.733260000000001 11.91467 13.551850000000002 ZT4-7 7.104755000000001 7.104755000000001 7.104755000000001 ZT8-11 4.981085 4.981085 4.981085 ZT12-15 0 0 0 ZT16-19 11.7864 11.7864 11.7864 ZT20-23 10.988165 10.988165 10.988165