condition mean min max ZT0-3 16.0164 16.0164 16.0164 ZT4-7 14.1223 14.1223 14.1223 ZT8-11 14.761050000000001 14.761050000000001 14.761050000000001 ZT12-15 11.379850000000001 11.379850000000001 11.379850000000001 ZT16-19 17.8415 17.8415 17.8415 ZT20-23 18.8992 18.8992 18.8992