condition mean min max ZT0-3 30.57145 30.57145 30.57145 ZT4-7 59.1061 59.1061 59.1061 ZT8-11 27.84785 27.84785 27.84785 ZT12-15 13.2616 13.2616 13.2616 ZT16-19 14.7146 14.7146 14.7146 ZT20-23 20.07565 20.07565 20.07565