condition mean min max ZT0-3 74.388068 74.388068 74.388068 ZT4-7 76.6255945 76.6255945 76.6255945 ZT8-11 79.1917975 79.1917975 79.1917975 ZT12-15 79.1502115 79.1502115 79.1502115 ZT16-19 83.787047 83.787047 83.787047 ZT20-23 75.506129 75.506129 75.506129