condition mean min max ZT0-3 23.670350000000003 23.49705 23.8744 ZT4-7 20.69845 20.69845 20.69845 ZT8-11 25.78575 25.78575 25.78575 ZT12-15 33.23615 30.8554 35.6169 ZT16-19 25.57845 25.57845 25.57845 ZT20-23 28.30425 28.30425 28.30425