condition mean min max ZT0-3 0.45789350000000006 0.403936 0.5118510000000001 ZT4-7 1.036362 1.036362 1.036362 ZT8-11 0.6893315 0.6893315 0.6893315 ZT12-15 0 0 0 ZT16-19 0.9651605000000001 0.9651605000000001 0.9651605000000001 ZT20-23 0.7409395 0.7409395 0.7409395