condition mean min max ZT0-3 4.04720142975 3.523387366 4.5710154935 ZT4-7 3.60721603875 3.5200850344999997 3.694347043 ZT8-11 3.15546867275 3.0338852555000004 3.2770520899999998 ZT12-15 0.8448405715 0.2518578835 1.4378232595 ZT16-19 0.08421405400000001 0.0420091895 0.1264189185 ZT20-23 0.026910084249999997 0.008082794499999999 0.045737374