condition mean min max ZT0-3 4.491702500000001 4.198685 4.78472 ZT4-7 3.583095 3.583095 3.583095 ZT8-11 2.9860049999999996 2.9860049999999996 2.9860049999999996 ZT12-15 0 0 0 ZT16-19 5.719035 5.719035 5.719035 ZT20-23 5.64994 5.64994 5.64994