condition mean min max ZT0-3 3.73392 3.73392 3.73392 ZT4-7 4.35844 4.35844 4.35844 ZT8-11 3.544935 3.544935 3.544935 ZT12-15 2.164745 2.164745 2.164745 ZT16-19 11.461929999999999 11.461929999999999 11.461929999999999 ZT20-23 8.500215 8.500215 8.500215