condition mean min max ZT0-3 8.811914999999999 8.811914999999999 8.811914999999999 ZT4-7 8.551095 8.551095 8.551095 ZT8-11 7.53107 7.53107 7.53107 ZT12-15 9.490595 9.490595 9.490595 ZT16-19 9.17747 9.17747 9.17747 ZT20-23 8.99226 8.99226 8.99226