condition mean min max ZT0-3 10.617871 10.617871 10.617871 ZT4-7 10.453235 10.453235 10.453235 ZT8-11 11.998006499999999 11.998006499999999 11.998006499999999 ZT12-15 11.1539065 11.1539065 11.1539065 ZT16-19 10.582695000000001 10.582695000000001 10.582695000000001 ZT20-23 10.5733655 10.5733655 10.5733655