condition mean min max ZT0-3 20.32073 20.32073 20.32073 ZT4-7 26.093554 26.093554 26.093554 ZT8-11 16.099549500000002 16.099549500000002 16.099549500000002 ZT12-15 20.183343999999998 20.183343999999998 20.183343999999998 ZT16-19 34.9205235 34.9205235 34.9205235 ZT20-23 28.132026000000003 28.132026000000003 28.132026000000003