condition mean min max ZT0-3 0.4257975 0.4257975 0.4257975 ZT4-7 0.211756 0.211756 0.211756 ZT8-11 0.448726 0.448726 0.448726 ZT12-15 0.510402 0.510402 0.510402 ZT16-19 0.5558185 0.5558185 0.5558185 ZT20-23 0.504471 0.504471 0.504471