condition mean min max ZT0-3 13.0755 11.664 14.487 ZT4-7 14.6075 14.6075 14.6075 ZT8-11 38.20975 38.20975 38.20975 ZT12-15 0 0 0 ZT16-19 39.32915 39.32915 39.32915 ZT20-23 23.85585 23.85585 23.85585