condition mean min max ZT0-3 0.01298505 0.0 0.01972935 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0383398 0.0383398 0.0383398 ZT20-23 0.04246175 0.04246175 0.04246175