condition mean min max ZT0-3 300.368444 300.368444 300.368444 ZT4-7 302.93727249999995 302.93727249999995 302.93727249999995 ZT8-11 326.445809 326.445809 326.445809 ZT12-15 325.1186705 325.1186705 325.1186705 ZT16-19 360.035704 360.035704 360.035704 ZT20-23 327.13498849999996 327.13498849999996 327.13498849999996