condition mean min max ZT0-3 0.547596 0.547596 0.547596 ZT4-7 0.474038 0.474038 0.474038 ZT8-11 0.4823535 0.4823535 0.4823535 ZT12-15 0.36406900000000003 0.36406900000000003 0.36406900000000003 ZT16-19 0.7352965 0.7352965 0.7352965 ZT20-23 0.550092 0.550092 0.550092