condition mean min max ZT0-3 0.92916144725 0.3423500795 1.515972815 ZT4-7 1.44526015375 0.8720530555000001 2.018467252 ZT8-11 4.3409029865 3.74555841 4.936247563 ZT12-15 8.385384252000001 6.5193495385 10.251418965500001 ZT16-19 6.085516081000001 5.6262498050000005 6.544782357000001 ZT20-23 8.9290593435 7.8882686445 9.9698500425