condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.024906988 0.0 0.049813976 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0851137615 0.047654046000000005 0.122573477 ZT20-23 0.14863868000000002 0.08790484100000001 0.209372519