condition mean min max ZT0-3 9.5583425 9.53054 9.586145 ZT4-7 11.927299999999999 11.927299999999999 11.927299999999999 ZT8-11 18.74275 18.74275 18.74275 ZT12-15 0 0 0 ZT16-19 18.13725 18.13725 18.13725 ZT20-23 16.09635 16.09635 16.09635