condition mean min max ZT0-3 12.048912 12.048912 12.048912 ZT4-7 10.908046500000001 10.908046500000001 10.908046500000001 ZT8-11 10.7800385 10.7800385 10.7800385 ZT12-15 11.0950885 11.0950885 11.0950885 ZT16-19 12.371517 12.371517 12.371517 ZT20-23 13.020471 13.020471 13.020471