condition mean min max ZT0-3 9.104908333333334 4.2760750000000005 12.36945 ZT4-7 3.7673050000000003 3.7673050000000003 3.7673050000000003 ZT8-11 4.720715 4.720715 4.720715 ZT12-15 9.0449925 8.164109999999999 9.925875 ZT16-19 9.744055 9.744055 9.744055 ZT20-23 16.21845 16.21845 16.21845