condition mean min max ZT0-3 261.525423 261.525423 261.525423 ZT4-7 100.55579750000001 100.55579750000001 100.55579750000001 ZT8-11 70.21985699999999 70.21985699999999 70.21985699999999 ZT12-15 74.500662 74.500662 74.500662 ZT16-19 40.757657 40.757657 40.757657 ZT20-23 30.1201315 30.1201315 30.1201315