highly significantP < 0.01
A t > t 0.05( n -1) indicates considerable clumping ( P < 0.05), whereas t > t 0.01( n -1) indicates highly significant clumping ( P < 0.01).
A t > t 0.05( n -1) indicates considerable clumping ( P < 0.05), whereas t > t 0.01( n -1) indicates highly significant clumping ( P < 0.01).