condition mean min max ZT0-3 5.69688 5.69688 5.69688 ZT4-7 7.885325 7.885325 7.885325 ZT8-11 8.220185 8.220185 8.220185 ZT12-15 5.931095 5.931095 5.931095 ZT16-19 5.31114 5.31114 5.31114 ZT20-23 4.69892 4.69892 4.69892