Next weekend sees the Battles round of The Voice, with pairs of team members performing sing-offs against one another for a place in the live shows. But what about the battles we've already witnessed - those between the coaches? Who's come out on top there?

In this case, it seems the female of the species is deadlier than the male because Jessie J has won an impressive 62 per cent of her face-offs with her fellow coaches.

On eight of the 13 occasions on which Jessie has turned her chair round along with one or more of the others, she's been the coach the act has chosen - Jessie wins almost two-thirds of the time.

Danny O'Donoghue is the next most successful, enticing 37 per cent of acts (seven out of 19) to join him when going head-to-head with other coaches, while will.i.am is not far behind, winning exactly one third (33 per cent) of his 18 battles.

Sir Tom Jones, meanwhile, may be a heavyweight of the music world, but it seems he has something of a glass jaw when it comes to bouts with his fellow coaches - he's won just 19 per cent (three of 16).

Average ages of the acts in each team

Sir Tom Jones (age: 71) - 32.9 years

Danny O'Donoghue (age: 31) - 26.9 years

Will.i.am (age: 37) - 23.3 years

Jessie J (age: 24) - 22.82 years

Performances of coaches' own songs or recordings

Jessie J - two songs (Price Tag, sung by Jessica Hammond - show one; Mamma Knows Best, sung by J Marie Cooper - show one)

Will.i.am - two songs (Where Is the Love with The Black Eyed Peas, sung by Frances Wood - show two; Ordinary People co-written with and performed by John Legend - show four - also performed for a second time in that round by Jaz Ellington, following a request from Jessie)

Danny O'Donoghue - one song (The Man Who Can't Be Moved by The Script, sung by David Julien - show two)

Sir Tom Jones - one song (I Who Have Nothing, sung by Ben Lake - show four)

Most-performed artist

Adele - three songs (Set Fire to the Rain, sung by Samuel Buttery - show one; Rolling in the Deep, sung by Joelle Moses - show three; Someone like You, sung by Alys Williams - show three)