Table 1 Socio-demographic, mobile and cordless phone use characteristics of children

Variables

Baseline [n = 619]

Follow-up [n = 412]

 Age (mean ± SD)

10 ± 0.4 years

11 ± 0.5 years

 Sex

53% (n = 329) girls

55% (n = 227) girls

 Ownership/use of a MP (parent’s response)

31.0% (n = 187)

43.3% (n = 168)

 Ownership/and use of a MP (children’s response)

57.3% (n = 353)

67.9% (n = 279)

 Laterality of MP use

Right: 68.2% (n = 262)

Left: 11.5% (n = 44)

Both: 18.5% (n = 71)

Right: 74.2% (n = 250)

Left: 10.7% (n = 36)

Both: 14.0% (n = 47)

 Use of a CP at home

76% (n = 470)

76.2% (n = 314)

Average duration per call (minutes) weekly

Median (25^th, 75^th percentiles)

Median (25^th, 75^th percentiles)

 A call dialed on MP

2 (1, 3)

2 (1, 3)

 A call received on MP

1.5 (0, 3)

1.5 (0.5, 3)

 Call (dialed & received) on CP

3.5 (2, 5)

4 (2, 5.5)