condition mean min max ZT0-3 1.3319846666666668 1.13437 1.4360835 ZT4-7 0.5800339999999999 0.5800339999999999 0.5800339999999999 ZT8-11 0.0 0.0 0.0 ZT12-15 1.33461625 0.9243175 1.744915 ZT16-19 2.466705 2.466705 2.466705 ZT20-23 1.1336475 1.1336475 1.1336475