condition mean min max ZT0-3 117.232057 117.232057 117.232057 ZT4-7 118.837098 118.837098 118.837098 ZT8-11 131.040161 131.040161 131.040161 ZT12-15 79.453463 79.453463 79.453463 ZT16-19 139.9102895 139.9102895 139.9102895 ZT20-23 104.44315449999999 104.44315449999999 104.44315449999999