condition mean min max ZT0-3 4.506467499999999 4.015485 4.99745 ZT4-7 3.384275 3.384275 3.384275 ZT8-11 1.917745 1.917745 1.917745 ZT12-15 0 0 0 ZT16-19 3.006565 3.006565 3.006565 ZT20-23 5.96679 5.96679 5.96679