condition mean min max ZT0-3 0.991968 0.8366009999999999 1.147335 ZT4-7 0.737326 0.737326 0.737326 ZT8-11 0.6859535 0.6859535 0.6859535 ZT12-15 0 0 0 ZT16-19 0.5639460000000001 0.5639460000000001 0.5639460000000001 ZT20-23 0.6209385000000001 0.6209385000000001 0.6209385000000001