condition mean min max ZT0-3 19.1458 19.1458 19.1458 ZT4-7 14.03155 14.03155 14.03155 ZT8-11 13.98 13.98 13.98 ZT12-15 14.763349999999999 14.763349999999999 14.763349999999999 ZT16-19 22.8781 22.8781 22.8781 ZT20-23 20.736449999999998 20.736449999999998 20.736449999999998