condition mean min max ZT0-3 1.16587 0.634285 1.4344000000000001 ZT4-7 0.767925 0.767925 0.767925 ZT8-11 2.01496 2.01496 2.01496 ZT12-15 0.554035 0.0 1.10807 ZT16-19 0.3907195 0.3907195 0.3907195 ZT20-23 0.715605 0.715605 0.715605