condition mean min max ZT0-3 19.894349 19.894349 19.894349 ZT4-7 14.104059 14.104059 14.104059 ZT8-11 13.1672325 13.1672325 13.1672325 ZT12-15 14.126962 14.126962 14.126962 ZT16-19 17.2477665 17.2477665 17.2477665 ZT20-23 17.2722985 17.2722985 17.2722985