condition mean min max ZT0-3 30.972675 28.769849999999998 33.1755 ZT4-7 18.951349999999998 18.951349999999998 18.951349999999998 ZT8-11 24.137900000000002 24.137900000000002 24.137900000000002 ZT12-15 0 0 0 ZT16-19 30.36515 30.36515 30.36515 ZT20-23 41.2472 41.2472 41.2472