condition mean min max ZT0-3 7.16893033675 5.5806188610000005 8.7572418125 ZT4-7 13.1977487775 10.83023268 15.565264875 ZT8-11 9.19208156575 7.4676106135 10.916552518 ZT12-15 5.04963869525 4.957986658 5.1412907325 ZT16-19 5.8007056885 4.6309447385 6.9704666385 ZT20-23 9.088780262 8.842196469000001 9.335364055