condition mean min max ZT0-3 10.999777 10.999777 10.999777 ZT4-7 11.957246 11.957246 11.957246 ZT8-11 11.757657 11.757657 11.757657 ZT12-15 13.4524975 13.4524975 13.4524975 ZT16-19 11.3360585 11.3360585 11.3360585 ZT20-23 14.916402000000001 14.916402000000001 14.916402000000001