condition mean min max ZT0-3 0.73923625 0.6775295 0.800943 ZT4-7 0.3437905 0.3437905 0.3437905 ZT8-11 0.3425705 0.3425705 0.3425705 ZT12-15 0 0 0 ZT16-19 0.7311205000000001 0.7311205000000001 0.7311205000000001 ZT20-23 0.451781 0.451781 0.451781