condition mean min max ZT0-3 4.78187 4.78187 4.78187 ZT4-7 2.6508700000000003 2.6508700000000003 2.6508700000000003 ZT8-11 3.7457450000000003 3.7457450000000003 3.7457450000000003 ZT12-15 1.68268 1.68268 1.68268 ZT16-19 5.189415 5.189415 5.189415 ZT20-23 5.385495000000001 5.385495000000001 5.385495000000001