condition mean min max ZT0-3 8.3634 8.3634 8.3634 ZT4-7 9.3734575 9.3734575 9.3734575 ZT8-11 9.8302655 9.8302655 9.8302655 ZT12-15 8.546002999999999 8.546002999999999 8.546002999999999 ZT16-19 8.7299325 8.7299325 8.7299325 ZT20-23 9.355304499999999 9.355304499999999 9.355304499999999