condition mean min max ZT0-3 5.814115 5.75404 5.8741900000000005 ZT4-7 5.01754 5.01754 5.01754 ZT8-11 5.716705 5.716705 5.716705 ZT12-15 0 0 0 ZT16-19 7.674575 7.674575 7.674575 ZT20-23 6.80445 6.80445 6.80445