condition mean min max ZT0-3 0.04447615 0.0 0.106146 ZT4-7 0.0250533 0.0250533 0.0250533 ZT8-11 0.3159415 0.3159415 0.3159415 ZT12-15 0.17784424999999998 0.1096895 0.24599899999999997 ZT16-19 0.1983795 0.1983795 0.1983795 ZT20-23 0.112941 0.112941 0.112941