| TOTAL | 100 | 100 | 100 | 100 |
| | | | | |
| Total (absolute values) | 2.321.784 | 1.649.693 | 484.708 | 187.383 |
| WHAT LANGUAGE DO YOU SPEAK IN AT HOME? | | | | |
| Always or mainly in Basque language | 9,8 | 12,6 | 3,2 | 1,9 |
| More in Basque than in Spanish/French/other | 2,8 | 3,4 | 1,1 | 2,2 |
| Both in Basque and in Spanish/French/other | 3,6 | 3,9 | 2,1 | 4,8 |
| Less in Basque than in Spanish/French/other | 8,8 | 10,5 | 3,9 | 6,7 |
| Always or mainly in Spanish/French/other | 75,0 | 69,6 | 89,7 | 84,3 |
| | | | | |
| Total (absolute values) | 1.586.756 | 1.100.253 | 341.660 | 144.843 |
| WHAT LANGUAGE DO YOU NORMALLY USE WHEN SPAKING TO YOUR MOTHER? | | | | |
| Always or mainly in Basque language | 11,6 | 14,9 | 4,6 | 3,0 |
| More in Basque than in Spanish/French/other | 1,6 | 2,0 | 0,5 | 1,4 |
| Both in Basque and in Spanish/French/other | 1,8 | 1,8 | 1,1 | 3,8 |
| Less in Basque than in Spanish/French/other | 3,7 | 4,7 | 1,3 | 2,7 |
| Always or mainly in Spanish/French/other | 81,2 | 76,7 | 92,5 | 89,1 |
| | | | | |
| Total (absolute values) | 1.202.480 | 829.442 | 261.974 | 111.064 |
| WHAT LANGUAGE DO YOU NORMALLY USE WHEN SPEAKING TO YOUR FATHER? | | | | |
| Always or mainly in Basque language | 11,9 | 15,4 | 4,8 | 2,3 |
| More in Basque than in Spanish/French/other | 1,3 | 1,6 | 0,5 | 1,1 |
| Both in Basque and in Spanish/French/other | 1,4 | 1,3 | 1,1 | 3,3 |
| Less in Basque than in Spanish/French/other | 3,6 | 4,5 | 1,2 | 2,8 |
| Always or mainly in Spanish/French/other | 81,7 | 77,2 | 92,5 | 90,6 |
| | | | | |
| Total (absolute values) | 1.771.545 | 1.223.363 | 385.881 | 162.301 |
| WHAT LANGUAGE DO YOU SPEAK IN WITH YOUR PARTNER? | | | | |
| Always or mainly in Basque language | 9,9 | 13,1 | 3,1 | 2,3 |
| More in Basque than in Spanish/French/other | 1,9 | 2,2 | 0,8 | 2,3 |
| Both in Basque and in Spanish/French/other | 1,9 | 1,9 | 1,3 | 3,2 |
| Less in Basque than in Spanish/French/other | 5,0 | 6,1 | 2,4 | 3,1 |
| Always or mainly in Spanish/French/other | 81,3 | 76,7 | 92,5 | 89,2 |
| | | | | |
| Total (absolute values) | 1.767.873 | 1.252.451 | 336.997 | 178.425 |
| WHAT LANGUAGE DO YOU SPEAK IN WITH YOUR CHILDREN? | | | | |
| Always or mainly in Basque language | 14,6 | 18,6 | 5,6 | 3,5 |
| More in Basque than in Spanish/French/other | 2,1 | 2,2 | 1,2 | 3,1 |
| Both in Basque and in Spanish/French/other | 3,0 | 3,2 | 1,8 | 4,5 |
| Less in Basque than in Spanish/French/other | 6,7 | 8,0 | 2,4 | 5,7 |
| Always or mainly in Spanish/French/other | 73,5 | 67,9 | 89,0 | 83,2 |
| | | | | |
| Total (absolute values) | 2.368.186 | 1.651.921 | 494.874 | 221.391 |
| WHAT LANGUAGE DO YOU SPEAK WITH YOUR BROTHERS/SISTERS? | | | | |
| Always or mainly in Basque language | 11,9 | 15,3 | 4,6 | 2,6 |
| More in Basque than in Spanish/French/other | 1,9 | 2,2 | 0,8 | 1,9 |
| Both in Basque and in Spanish/French/other | 3,5 | 3,6 | 2,1 | 5,9 |
| Less in Basque than in Spanish/French/other | 5,5 | 6,4 | 3,2 | 3,8 |
| Always or mainly in Spanish/French/other | 77,2 | 72,5 | 89,3 | 85,7 |