condition mean min max ZT0-3 12.234985 12.234985 12.234985 ZT4-7 12.4447355 12.4447355 12.4447355 ZT8-11 14.137497 14.137497 14.137497 ZT12-15 11.98433 11.98433 11.98433 ZT16-19 15.313769 15.313769 15.313769 ZT20-23 16.7661095 16.7661095 16.7661095