condition mean min max ZT0-3 49.445581 49.445581 49.445581 ZT4-7 74.0301785 74.0301785 74.0301785 ZT8-11 68.0029505 68.0029505 68.0029505 ZT12-15 76.4790295 76.4790295 76.4790295 ZT16-19 69.5393095 69.5393095 69.5393095 ZT20-23 56.261893 56.261893 56.261893