condition mean min max ZT0-3 1.1954850000000001 1.1954850000000001 1.1954850000000001 ZT4-7 2.1982235 2.1982235 2.1982235 ZT8-11 1.368616 1.368616 1.368616 ZT12-15 1.5903645 1.5903645 1.5903645 ZT16-19 0.956835 0.956835 0.956835 ZT20-23 0.851418 0.851418 0.851418