condition mean min max ZT0-3 674.050619 674.050619 674.050619 ZT4-7 540.0267895 540.0267895 540.0267895 ZT8-11 525.555694 525.555694 525.555694 ZT12-15 546.2874664999999 546.2874664999999 546.2874664999999 ZT16-19 644.5415615 644.5415615 644.5415615 ZT20-23 682.856072 682.856072 682.856072