condition mean min max ZT0-3 12.6997 12.6997 12.6997 ZT4-7 10.609850000000002 10.609850000000002 10.609850000000002 ZT8-11 7.579685 7.579685 7.579685 ZT12-15 6.608325 6.608325 6.608325 ZT16-19 9.119810000000001 9.119810000000001 9.119810000000001 ZT20-23 12.01875 12.01875 12.01875