condition mean min max ZT0-3 0.01999095 0.01999095 0.01999095 ZT4-7 0.0278229 0.0278229 0.0278229 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0240634 0.0240634 0.0240634 ZT20-23 0.04781065 0.04781065 0.04781065