condition mean min max ZT0-3 1.903835 1.903835 1.903835 ZT4-7 0.9572335000000001 0.9572335000000001 0.9572335000000001 ZT8-11 0.958776 0.958776 0.958776 ZT12-15 1.0143695 1.0143695 1.0143695 ZT16-19 0.5719339999999999 0.5719339999999999 0.5719339999999999 ZT20-23 1.2670249999999998 1.2670249999999998 1.2670249999999998