condition mean min max ZT0-3 7.200191666666667 5.72668 9.352630000000001 ZT4-7 11.2234 11.2234 11.2234 ZT8-11 13.09235 13.09235 13.09235 ZT12-15 10.427115 9.22523 11.629 ZT16-19 8.83754 8.83754 8.83754 ZT20-23 7.96335 7.96335 7.96335