condition mean min max ZT0-3 53.3573 50.05575 56.65885 ZT4-7 34.1035 34.1035 34.1035 ZT8-11 18.2584 18.2584 18.2584 ZT12-15 0 0 0 ZT16-19 18.153399999999998 18.153399999999998 18.153399999999998 ZT20-23 32.8399 32.8399 32.8399