condition mean min max ZT0-3 34.245142 34.245142 34.245142 ZT4-7 56.650131 56.650131 56.650131 ZT8-11 52.8564565 52.8564565 52.8564565 ZT12-15 42.673758 42.673758 42.673758 ZT16-19 36.0232515 36.0232515 36.0232515 ZT20-23 34.0548325 34.0548325 34.0548325