condition mean min max ZT0-3 1.18559 0.716395 1.584015 ZT4-7 0.8688800000000001 0.8688800000000001 0.8688800000000001 ZT8-11 0.5576445 0.5576445 0.5576445 ZT12-15 1.594116 1.506005 1.6822270000000001 ZT16-19 2.125735 2.125735 2.125735 ZT20-23 1.6878205 1.6878205 1.6878205