condition mean min max ZT0-3 52.720497879166665 50.25560634333333 55.185389414999996 ZT4-7 50.937254530000004 47.79478573 54.07972333 ZT8-11 50.077080775 45.376390040000004 54.77777151 ZT12-15 43.02178868833333 42.53903055 43.50454682666667 ZT16-19 50.452936885 50.22138802 50.68448575 ZT20-23 48.65592870166667 48.197448789999996 49.11440861333333