condition mean min max ZT0-3 369.248262 369.248262 369.248262 ZT4-7 418.264446 418.264446 418.264446 ZT8-11 266.385903 266.385903 266.385903 ZT12-15 264.0740735 264.0740735 264.0740735 ZT16-19 91.73878500000001 91.73878500000001 91.73878500000001 ZT20-23 118.954737 118.954737 118.954737