condition mean min max ZT0-3 0.2325835 0.23104999999999998 0.23411700000000002 ZT4-7 0.349788 0.349788 0.349788 ZT8-11 0.8166445 0.8166445 0.8166445 ZT12-15 0 0 0 ZT16-19 0.9202730000000001 0.9202730000000001 0.9202730000000001 ZT20-23 0.808237 0.808237 0.808237