condition mean min max ZT0-3 2.0028315 0.9388345 3.84746 ZT4-7 1.03697 1.03697 1.03697 ZT8-11 1.9119000000000002 1.9119000000000002 1.9119000000000002 ZT12-15 1.300903 0.968826 1.6329799999999999 ZT16-19 0.6708355 0.6708355 0.6708355 ZT20-23 0.898485 0.898485 0.898485