condition mean min max ZT0-3 30.393016666666668 17.923849999999998 38.6062 ZT4-7 16.91805 16.91805 16.91805 ZT8-11 48.5347 48.5347 48.5347 ZT12-15 28.676250000000003 26.6146 30.737900000000003 ZT16-19 28.6453 28.6453 28.6453 ZT20-23 44.81775 44.81775 44.81775