condition mean min max ZT0-3 1.93858 1.93858 1.93858 ZT4-7 0.8286865000000001 0.8286865000000001 0.8286865000000001 ZT8-11 0.9713324999999999 0.9713324999999999 0.9713324999999999 ZT12-15 1.28878 1.28878 1.28878 ZT16-19 2.67402 2.67402 2.67402 ZT20-23 1.630782 1.630782 1.630782