condition mean min max ZT0-3 1265.138397 1265.138397 1265.138397 ZT4-7 1838.0860874999998 1838.0860874999998 1838.0860874999998 ZT8-11 1619.4103850000001 1619.4103850000001 1619.4103850000001 ZT12-15 1542.5657139999998 1542.5657139999998 1542.5657139999998 ZT16-19 1413.7118169999999 1413.7118169999999 1413.7118169999999 ZT20-23 1226.9409839999998 1226.9409839999998 1226.9409839999998