condition mean min max ZT0-3 24.135344 24.135344 24.135344 ZT4-7 17.1509305 17.1509305 17.1509305 ZT8-11 13.505613 13.505613 13.505613 ZT12-15 14.6983355 14.6983355 14.6983355 ZT16-19 12.369702 12.369702 12.369702 ZT20-23 12.742352 12.742352 12.742352