condition mean min max ZT0-3 11.45527 11.45527 11.45527 ZT4-7 12.5634055 12.5634055 12.5634055 ZT8-11 9.802124 9.802124 9.802124 ZT12-15 16.9306385 16.9306385 16.9306385 ZT16-19 10.310859 10.310859 10.310859 ZT20-23 12.259229000000001 12.259229000000001 12.259229000000001