condition mean min max ZT0-3 80.183183 80.183183 80.183183 ZT4-7 445.77934849999997 445.77934849999997 445.77934849999997 ZT8-11 440.86293250000006 440.86293250000006 440.86293250000006 ZT12-15 299.8158335 299.8158335 299.8158335 ZT16-19 354.937799 354.937799 354.937799 ZT20-23 272.21164450000003 272.21164450000003 272.21164450000003