condition mean min max ZT0-3 10.767027500000001 10.515550000000001 11.018505 ZT4-7 8.38412 8.38412 8.38412 ZT8-11 9.7378 9.7378 9.7378 ZT12-15 0 0 0 ZT16-19 15.94435 15.94435 15.94435 ZT20-23 14.9634 14.9634 14.9634