condition mean min max ZT0-3 0.18627183333333333 0.0995485 0.261849 ZT4-7 0.2719315 0.2719315 0.2719315 ZT8-11 0.095499 0.095499 0.095499 ZT12-15 0.6055142499999999 0.39686 0.8141685 ZT16-19 0.5937365 0.5937365 0.5937365 ZT20-23 0.24847999999999998 0.24847999999999998 0.24847999999999998