condition mean min max ZT0-3 7.3348700000000004 6.832990000000001 7.83675 ZT4-7 4.040045 4.040045 4.040045 ZT8-11 5.63347 5.63347 5.63347 ZT12-15 0 0 0 ZT16-19 7.705805 7.705805 7.705805 ZT20-23 5.545795 5.545795 5.545795