condition mean min max ZT0-3 20.4474 20.322049999999997 20.57275 ZT4-7 25.07825 25.07825 25.07825 ZT8-11 29.4876 29.4876 29.4876 ZT12-15 0 0 0 ZT16-19 23.1888 23.1888 23.1888 ZT20-23 28.2742 28.2742 28.2742