condition mean min max ZT0-3 21.524700000000003 21.524700000000003 21.524700000000003 ZT4-7 18.68555 18.68555 18.68555 ZT8-11 10.7245 10.7245 10.7245 ZT12-15 11.7461 11.7461 11.7461 ZT16-19 15.88045 15.88045 15.88045 ZT20-23 19.472250000000003 19.472250000000003 19.472250000000003