condition mean min max ZT0-3 6.62322 5.667655 7.578785 ZT4-7 5.203060000000001 5.203060000000001 5.203060000000001 ZT8-11 23.77955 23.77955 23.77955 ZT12-15 0 0 0 ZT16-19 16.990000000000002 16.990000000000002 16.990000000000002 ZT20-23 12.3453 12.3453 12.3453