condition mean min max ZT0-3 0.03027585 0.03027585 0.03027585 ZT4-7 0.0836215 0.0836215 0.0836215 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.11038400000000001 0.11038400000000001 0.11038400000000001 ZT20-23 0.0 0.0 0.0