condition mean min max ZT0-3 49.148606 49.148606 49.148606 ZT4-7 73.3929235 73.3929235 73.3929235 ZT8-11 44.311246 44.311246 44.311246 ZT12-15 23.8194445 23.8194445 23.8194445 ZT16-19 21.138925999999998 21.138925999999998 21.138925999999998 ZT20-23 21.39251 21.39251 21.39251