condition mean min max ZT0-3 67.215748 67.215748 67.215748 ZT4-7 86.280665 86.280665 86.280665 ZT8-11 88.5664525 88.5664525 88.5664525 ZT12-15 83.914594 83.914594 83.914594 ZT16-19 87.56436500000001 87.56436500000001 87.56436500000001 ZT20-23 92.042582 92.042582 92.042582