condition mean min max ZT0-3 4.3572074999999995 4.345185 4.36923 ZT4-7 3.9005900000000002 3.9005900000000002 3.9005900000000002 ZT8-11 4.15557 4.15557 4.15557 ZT12-15 0 0 0 ZT16-19 5.202065 5.202065 5.202065 ZT20-23 5.343335 5.343335 5.343335