condition mean min max ZT0-3 1.4649717500000001 1.0383235 1.89162 ZT4-7 8.286235 8.286235 8.286235 ZT8-11 2.48928 2.48928 2.48928 ZT12-15 0 0 0 ZT16-19 0.6195635 0.6195635 0.6195635 ZT20-23 1.144082 1.144082 1.144082