condition mean min max ZT0-3 5.7801975 5.584565 5.97583 ZT4-7 5.302350000000001 5.302350000000001 5.302350000000001 ZT8-11 4.948725 4.948725 4.948725 ZT12-15 0 0 0 ZT16-19 6.07109 6.07109 6.07109 ZT20-23 5.965275 5.965275 5.965275