condition mean min max ZT0-3 3.7280992085 3.463014235 3.9931841820000002 ZT4-7 9.550416714 6.785668488000001 12.315164939999999 ZT8-11 15.461044662499999 14.826492734999999 16.09559659 ZT12-15 9.261952943 8.457868458 10.066037428 ZT16-19 9.606540879499999 8.140892365 11.072189394 ZT20-23 18.9425666325 15.432706195 22.45242707