condition mean min max ZT0-3 332.324143 332.324143 332.324143 ZT4-7 1359.630952 1359.630952 1359.630952 ZT8-11 1219.3093375 1219.3093375 1219.3093375 ZT12-15 489.7155225 489.7155225 489.7155225 ZT16-19 186.044571 186.044571 186.044571 ZT20-23 178.315595 178.315595 178.315595