condition mean min max ZT0-3 9.91153 9.91153 9.91153 ZT4-7 9.712545500000001 9.712545500000001 9.712545500000001 ZT8-11 9.1135815 9.1135815 9.1135815 ZT12-15 8.965371 8.965371 8.965371 ZT16-19 9.0973095 9.0973095 9.0973095 ZT20-23 36.1655235 36.1655235 36.1655235