condition mean min max ZT0-3 246.126653 246.126653 246.126653 ZT4-7 162.330008 162.330008 162.330008 ZT8-11 238.7652145 238.7652145 238.7652145 ZT12-15 228.024756 228.024756 228.024756 ZT16-19 302.0557515 302.0557515 302.0557515 ZT20-23 271.84004 271.84004 271.84004