condition mean min max ZT0-3 10.257289 10.257289 10.257289 ZT4-7 12.257856 12.257856 12.257856 ZT8-11 10.645048 10.645048 10.645048 ZT12-15 10.706764499999998 10.706764499999998 10.706764499999998 ZT16-19 10.986648500000001 10.986648500000001 10.986648500000001 ZT20-23 10.8761365 10.8761365 10.8761365