condition mean min max ZT0-3 0.21575775 0.0 0.4315155 ZT4-7 1.74097 1.74097 1.74097 ZT8-11 1.7452965 1.7452965 1.7452965 ZT12-15 0 0 0 ZT16-19 1.2937015 1.2937015 1.2937015 ZT20-23 0.8720755 0.8720755 0.8720755