condition mean min max ZT0-3 2.0459075 1.5891250000000001 2.50269 ZT4-7 2.931835 2.931835 2.931835 ZT8-11 4.146885 4.146885 4.146885 ZT12-15 0 0 0 ZT16-19 2.8471 2.8471 2.8471 ZT20-23 2.471195 2.471195 2.471195