condition mean min max ZT0-3 4.04154 3.7218999999999998 4.419370000000001 ZT4-7 4.359635 4.359635 4.359635 ZT8-11 2.9611549999999998 2.9611549999999998 2.9611549999999998 ZT12-15 3.1081625 2.19984 4.016485 ZT16-19 3.66186 3.66186 3.66186 ZT20-23 2.8574200000000003 2.8574200000000003 2.8574200000000003