condition mean min max ZT0-3 14.922629 14.922629 14.922629 ZT4-7 15.6189735 15.6189735 15.6189735 ZT8-11 11.958563 11.958563 11.958563 ZT12-15 13.067156 13.067156 13.067156 ZT16-19 11.305201 11.305201 11.305201 ZT20-23 11.6050725 11.6050725 11.6050725