condition mean min max ZT0-3 19.04552 19.04552 19.04552 ZT4-7 17.100906000000002 17.100906000000002 17.100906000000002 ZT8-11 16.3076625 16.3076625 16.3076625 ZT12-15 14.51847 14.51847 14.51847 ZT16-19 16.253873 16.253873 16.253873 ZT20-23 14.379623500000001 14.379623500000001 14.379623500000001