condition mean min max ZT0-3 1.213143 0.9406085 1.70127 ZT4-7 0.98544 0.98544 0.98544 ZT8-11 0.7604595000000001 0.7604595000000001 0.7604595000000001 ZT12-15 2.5521575 2.291205 2.81311 ZT16-19 1.5899100000000002 1.5899100000000002 1.5899100000000002 ZT20-23 1.80925 1.80925 1.80925