condition mean min max ZT0-3 24.43595 24.43595 24.43595 ZT4-7 20.661 20.661 20.661 ZT8-11 16.74755 16.74755 16.74755 ZT12-15 15.5253 15.5253 15.5253 ZT16-19 25.13225 25.13225 25.13225 ZT20-23 23.2703 23.2703 23.2703