condition mean min max ZT0-3 0.009026016666666666 0.0 0.02707805 ZT4-7 0.0253507 0.0253507 0.0253507 ZT8-11 0.0 0.0 0.0 ZT12-15 0.013149975000000001 0.0129873 0.01331265 ZT16-19 0.0 0.0 0.0 ZT20-23 0.014026 0.014026 0.014026