condition mean min max ZT0-3 10.352920000000001 8.20879 12.497050000000002 ZT4-7 7.476145000000001 7.476145000000001 7.476145000000001 ZT8-11 8.766985 8.766985 8.766985 ZT12-15 0 0 0 ZT16-19 10.405650000000001 10.405650000000001 10.405650000000001 ZT20-23 8.62314 8.62314 8.62314