condition mean min max ZT0-3 8.52335 8.52335 8.52335 ZT4-7 10.463422999999999 10.463422999999999 10.463422999999999 ZT8-11 9.3862445 9.3862445 9.3862445 ZT12-15 9.054291 9.054291 9.054291 ZT16-19 9.4645955 9.4645955 9.4645955 ZT20-23 8.5949645 8.5949645 8.5949645