condition mean min max ZT0-3 137.263478 137.263478 137.263478 ZT4-7 123.0956395 123.0956395 123.0956395 ZT8-11 158.647147 158.647147 158.647147 ZT12-15 188.7796275 188.7796275 188.7796275 ZT16-19 171.94109450000002 171.94109450000002 171.94109450000002 ZT20-23 151.8890915 151.8890915 151.8890915