condition mean min max ZT0-3 0.24279078333333334 0.13359435 0.3457565 ZT4-7 0.1529645 0.1529645 0.1529645 ZT8-11 1.628705 1.628705 1.628705 ZT12-15 2.0697324999999998 1.56589 2.573575 ZT16-19 1.4056700000000002 1.4056700000000002 1.4056700000000002 ZT20-23 0.8497535 0.8497535 0.8497535