condition mean min max ZT0-3 141.430195 141.430195 141.430195 ZT4-7 218.899594 218.899594 218.899594 ZT8-11 220.24661600000002 220.24661600000002 220.24661600000002 ZT12-15 153.6990145 153.6990145 153.6990145 ZT16-19 230.5720145 230.5720145 230.5720145 ZT20-23 186.71047049999999 186.71047049999999 186.71047049999999