condition mean min max ZT0-3 8.14376 8.14376 8.14376 ZT4-7 10.3979195 10.3979195 10.3979195 ZT8-11 9.1586015 9.1586015 9.1586015 ZT12-15 9.2552585 9.2552585 9.2552585 ZT16-19 15.059289 15.059289 15.059289 ZT20-23 11.721061500000001 11.721061500000001 11.721061500000001