condition mean min max ZT0-3 7.47729 7.47729 7.47729 ZT4-7 4.455909999999999 4.455909999999999 4.455909999999999 ZT8-11 8.00524 8.00524 8.00524 ZT12-15 10.183365 10.183365 10.183365 ZT16-19 11.540199999999999 11.540199999999999 11.540199999999999 ZT20-23 7.26082 7.26082 7.26082