condition mean min max ZT0-3 0.1201585 0.0 0.240317 ZT4-7 0.235831 0.235831 0.235831 ZT8-11 0.5612895 0.5612895 0.5612895 ZT12-15 0 0 0 ZT16-19 0.3144615 0.3144615 0.3144615 ZT20-23 0.3167475 0.3167475 0.3167475