condition mean min max ZT0-3 563.851074 563.851074 563.851074 ZT4-7 625.237565 625.237565 625.237565 ZT8-11 388.693802 388.693802 388.693802 ZT12-15 374.617682 374.617682 374.617682 ZT16-19 151.992165 151.992165 151.992165 ZT20-23 142.5720205 142.5720205 142.5720205