condition mean min max ZT0-3 50.05168589 45.29358947 54.80978231 ZT4-7 19.04757378 13.895508435 24.199639124999997 ZT8-11 10.10088704475 8.775326297 11.4264477925 ZT12-15 18.51300303 15.95137545 21.07463061 ZT16-19 28.5787905175 26.41990117 30.737679865 ZT20-23 33.79701791 32.87205969 34.72197613