condition mean min max ZT0-3 4.16483 3.8478700000000003 4.48179 ZT4-7 5.3146450000000005 5.3146450000000005 5.3146450000000005 ZT8-11 5.05974 5.05974 5.05974 ZT12-15 0 0 0 ZT16-19 6.569240000000001 6.569240000000001 6.569240000000001 ZT20-23 5.04393 5.04393 5.04393