condition mean min max ZT0-3 6.11323 6.010955 6.215505 ZT4-7 5.7198899999999995 5.7198899999999995 5.7198899999999995 ZT8-11 5.192035000000001 5.192035000000001 5.192035000000001 ZT12-15 0 0 0 ZT16-19 4.989815 4.989815 4.989815 ZT20-23 4.19003 4.19003 4.19003