condition mean min max ZT0-3 2.43455 2.16895 2.772325 ZT4-7 1.255037 1.255037 1.255037 ZT8-11 1.1560350000000001 1.1560350000000001 1.1560350000000001 ZT12-15 1.052812 0.9899990000000001 1.115625 ZT16-19 1.14874 1.14874 1.14874 ZT20-23 2.257985 2.257985 2.257985