condition mean min max ZT0-3 38.684588 38.684588 38.684588 ZT4-7 38.7064255 38.7064255 38.7064255 ZT8-11 39.541570500000006 39.541570500000006 39.541570500000006 ZT12-15 40.7397785 40.7397785 40.7397785 ZT16-19 38.7668355 38.7668355 38.7668355 ZT20-23 40.194611 40.194611 40.194611