condition mean min max ZT0-3 0.016145725 0.0 0.03229145 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 0.012712783333333333 0.0 0.025425566666666666 ZT20-23 0 0 0