condition mean min max ZT0-3 320.812714 320.812714 320.812714 ZT4-7 303.966187 303.966187 303.966187 ZT8-11 389.078211 389.078211 389.078211 ZT12-15 302.3682705 302.3682705 302.3682705 ZT16-19 343.3833765 343.3833765 343.3833765 ZT20-23 373.2670395 373.2670395 373.2670395