condition mean min max ZT0-3 655.350909 655.350909 655.350909 ZT4-7 756.9476935 756.9476935 756.9476935 ZT8-11 1081.1935405 1081.1935405 1081.1935405 ZT12-15 1123.010074 1123.010074 1123.010074 ZT16-19 829.1377044999999 829.1377044999999 829.1377044999999 ZT20-23 545.3318320000001 545.3318320000001 545.3318320000001