condition mean min max ZT0-3 10.255017 10.255017 10.255017 ZT4-7 10.963183 10.963183 10.963183 ZT8-11 11.7697 11.7697 11.7697 ZT12-15 13.880946 13.880946 13.880946 ZT16-19 11.21419 11.21419 11.21419 ZT20-23 13.1077245 13.1077245 13.1077245