condition mean min max ZT0-3 2.4260900000000003 2.3501250000000002 2.502055 ZT4-7 4.00924 4.00924 4.00924 ZT8-11 3.6489000000000003 3.6489000000000003 3.6489000000000003 ZT12-15 0 0 0 ZT16-19 3.659435 3.659435 3.659435 ZT20-23 5.07319 5.07319 5.07319