condition mean min max ZT0-3 10.821041 10.821041 10.821041 ZT4-7 11.012035000000001 11.012035000000001 11.012035000000001 ZT8-11 10.066465 10.066465 10.066465 ZT12-15 9.858540000000001 9.858540000000001 9.858540000000001 ZT16-19 10.264497500000001 10.264497500000001 10.264497500000001 ZT20-23 9.955909 9.955909 9.955909