condition mean min max ZT0-3 92.318015 92.318015 92.318015 ZT4-7 58.7825115 58.7825115 58.7825115 ZT8-11 50.0784015 50.0784015 50.0784015 ZT12-15 55.84205 55.84205 55.84205 ZT16-19 47.4006435 47.4006435 47.4006435 ZT20-23 55.9297525 55.9297525 55.9297525