condition mean min max ZT0-3 36.6663 36.6663 36.6663 ZT4-7 34.6936 34.6936 34.6936 ZT8-11 43.1894 43.1894 43.1894 ZT12-15 26.23885 26.23885 26.23885 ZT16-19 21.7394 21.7394 21.7394 ZT20-23 48.27905 48.27905 48.27905