condition mean min max ZT0-3 18.4084 18.4084 18.4084 ZT4-7 15.9382 15.9382 15.9382 ZT8-11 16.453 16.453 16.453 ZT12-15 14.953399999999998 14.953399999999998 14.953399999999998 ZT16-19 11.489 11.489 11.489 ZT20-23 14.3839 14.3839 14.3839