condition mean min max ZT0-3 0.0217211 0.0 0.0434422 ZT4-7 0.025702799999999998 0.025702799999999998 0.025702799999999998 ZT8-11 0.0 0.0 0.0 ZT12-15 0.00851225 0.0 0.0170245 ZT16-19 0.09937665000000001 0.08592306666666667 0.11283023333333334 ZT20-23 0 0 0