condition mean min max ZT0-3 353.906906 353.906906 353.906906 ZT4-7 471.26112850000004 471.26112850000004 471.26112850000004 ZT8-11 444.2591155 444.2591155 444.2591155 ZT12-15 423.9438725 423.9438725 423.9438725 ZT16-19 368.3410625 368.3410625 368.3410625 ZT20-23 385.6246085 385.6246085 385.6246085