condition mean min max ZT0-3 2.8297625 2.55886 3.1006650000000002 ZT4-7 2.779655 2.779655 2.779655 ZT8-11 1.62408 1.62408 1.62408 ZT12-15 0 0 0 ZT16-19 3.3550050000000002 3.3550050000000002 3.3550050000000002 ZT20-23 2.260975 2.260975 2.260975