condition mean min max ZT0-3 11.059825 11.059825 11.059825 ZT4-7 5.820235 5.820235 5.820235 ZT8-11 13.924949999999999 13.924949999999999 13.924949999999999 ZT12-15 16.891550000000002 16.891550000000002 16.891550000000002 ZT16-19 18.811300000000003 18.811300000000003 18.811300000000003 ZT20-23 16.195 16.195 16.195