condition mean min max ZT0-3 8.861069 8.861069 8.861069 ZT4-7 9.762408 9.762408 9.762408 ZT8-11 9.787622500000001 9.787622500000001 9.787622500000001 ZT12-15 10.070673 10.070673 10.070673 ZT16-19 10.0634555 10.0634555 10.0634555 ZT20-23 9.766399 9.766399 9.766399