condition mean min max ZT0-3 83.276541 83.276541 83.276541 ZT4-7 80.688444 80.688444 80.688444 ZT8-11 90.33089050000001 90.33089050000001 90.33089050000001 ZT12-15 85.7096005 85.7096005 85.7096005 ZT16-19 88.7787405 88.7787405 88.7787405 ZT20-23 92.550826 92.550826 92.550826