condition mean min max ZT0-3 0.21039575 0.1133825 0.307409 ZT4-7 0.1433478 0.1433478 0.1433478 ZT8-11 0.513243 0.513243 0.513243 ZT12-15 0 0 0 ZT16-19 0.38994799999999996 0.38994799999999996 0.38994799999999996 ZT20-23 0.2517335 0.2517335 0.2517335