condition mean min max ZT0-3 35.504533333333335 17.47515 45.231449999999995 ZT4-7 16.6808 16.6808 16.6808 ZT8-11 15.746300000000002 15.746300000000002 15.746300000000002 ZT12-15 17.1913 16.945349999999998 17.43725 ZT16-19 23.18705 23.18705 23.18705 ZT20-23 38.85925 38.85925 38.85925