condition mean min max ZT0-3 11.854968 11.854968 11.854968 ZT4-7 11.240476 11.240476 11.240476 ZT8-11 11.783824 11.783824 11.783824 ZT12-15 11.317014 11.317014 11.317014 ZT16-19 10.472811 10.472811 10.472811 ZT20-23 10.691277 10.691277 10.691277