condition mean min max ZT0-3 565.1821195 445.7888151 684.5754239 ZT4-7 244.271108475 228.90675075 259.6354662 ZT8-11 317.67843722500004 263.607486 371.74938845 ZT12-15 378.574205225 331.2381358 425.91027465 ZT16-19 288.23188425 274.3561024 302.10766609999996 ZT20-23 238.388116675 229.7617045 247.01452884999998