condition mean min max ZT0-3 37.734146 37.734146 37.734146 ZT4-7 42.234288 42.234288 42.234288 ZT8-11 43.710629 43.710629 43.710629 ZT12-15 50.792386 50.792386 50.792386 ZT16-19 38.49131199999999 38.49131199999999 38.49131199999999 ZT20-23 35.6832455 35.6832455 35.6832455