condition mean min max ZT0-3 19.750124999999997 17.764499999999998 21.73575 ZT4-7 18.61475 18.61475 18.61475 ZT8-11 30.54455 30.54455 30.54455 ZT12-15 0 0 0 ZT16-19 38.25215 38.25215 38.25215 ZT20-23 25.1332 25.1332 25.1332