condition mean min max ZT0-3 13.41105 12.7846 14.0375 ZT4-7 14.7412 14.7412 14.7412 ZT8-11 18.6334 18.6334 18.6334 ZT12-15 0 0 0 ZT16-19 18.60215 18.60215 18.60215 ZT20-23 16.41555 16.41555 16.41555