condition mean min max ZT0-3 217.011788 217.011788 217.011788 ZT4-7 285.9927045 285.9927045 285.9927045 ZT8-11 209.06965300000002 209.06965300000002 209.06965300000002 ZT12-15 211.89951100000002 211.89951100000002 211.89951100000002 ZT16-19 87.643494 87.643494 87.643494 ZT20-23 101.8689085 101.8689085 101.8689085