condition mean min max ZT0-3 6619.107553 6619.107553 6619.107553 ZT4-7 7297.055054500001 7297.055054500001 7297.055054500001 ZT8-11 4703.3778485 4703.3778485 4703.3778485 ZT12-15 5807.9168445 5807.9168445 5807.9168445 ZT16-19 6738.1459605 6738.1459605 6738.1459605 ZT20-23 4582.8423235 4582.8423235 4582.8423235