condition mean min max ZT0-3 4.9732575 4.9434450000000005 5.003069999999999 ZT4-7 2.74488 2.74488 2.74488 ZT8-11 2.58663 2.58663 2.58663 ZT12-15 0 0 0 ZT16-19 3.19257 3.19257 3.19257 ZT20-23 3.76592 3.76592 3.76592