condition mean min max ZT0-3 3.2481975000000003 2.75422 3.7421750000000005 ZT4-7 2.88239 2.88239 2.88239 ZT8-11 3.3817500000000003 3.3817500000000003 3.3817500000000003 ZT12-15 0 0 0 ZT16-19 4.399915 4.399915 4.399915 ZT20-23 4.419955 4.419955 4.419955