condition mean min max ZT0-3 8.6519375 8.572775 8.731100000000001 ZT4-7 7.408275 7.408275 7.408275 ZT8-11 7.61157 7.61157 7.61157 ZT12-15 0 0 0 ZT16-19 9.909790000000001 9.909790000000001 9.909790000000001 ZT20-23 11.7881 11.7881 11.7881