condition mean min max ZT0-3 13.394625 12.771149999999999 14.0181 ZT4-7 15.84075 15.84075 15.84075 ZT8-11 28.48075 28.48075 28.48075 ZT12-15 0 0 0 ZT16-19 24.7269 24.7269 24.7269 ZT20-23 18.8271 18.8271 18.8271