condition mean min max ZT0-3 0.111823375 0.09036545 0.1332813 ZT4-7 3.679745 3.679745 3.679745 ZT8-11 0.137857 0.137857 0.137857 ZT12-15 0 0 0 ZT16-19 1.1977635 1.1977635 1.1977635 ZT20-23 0.401636 0.401636 0.401636