condition mean min max ZT0-3 0.633369 0.633369 0.633369 ZT4-7 0.183959 0.183959 0.183959 ZT8-11 0.7126490000000001 0.7126490000000001 0.7126490000000001 ZT12-15 1.722248 1.722248 1.722248 ZT16-19 2.63743 2.63743 2.63743 ZT20-23 1.67788 1.67788 1.67788