condition mean min max ZT0-3 1.04555 1.04555 1.04555 ZT4-7 0.5870075 0.5870075 0.5870075 ZT8-11 0.6141575 0.6141575 0.6141575 ZT12-15 0.5292642999999999 0.5292642999999999 0.5292642999999999 ZT16-19 0.8933335 0.8933335 0.8933335 ZT20-23 0.558505 0.558505 0.558505