condition mean min max ZT0-3 184.616672 184.616672 184.616672 ZT4-7 220.7809085 220.7809085 220.7809085 ZT8-11 206.4215955 206.4215955 206.4215955 ZT12-15 195.07002699999998 195.07002699999998 195.07002699999998 ZT16-19 145.889429 145.889429 145.889429 ZT20-23 137.0651465 137.0651465 137.0651465