Table 2 Estimates of the mean and median of the time frame until the occurrence of the end of the contract according with the different factors of the study including the confidence interval of 95% (CI 95%) and the descriptive level

 Female

725

658

90.8%

2.1 (1.9–2.3)

1.1 (1.0–1.3)

0.529

 Male

653

590

90.4%

2.2 (2.0–2.4)

1.2 (1.0–1.4)

  ≤ 25 years

269

248

92.2%

1.4 (1.2–1.6)

0.8 (0.6–1.0)

< 0.001

 25 --| 30 years

492

456

92.7%

1.8 (1.6–2.1)

1.1 (0.9–1.3)

  ≥ 30 years

617

544

88.2%

2.7 (2.4–3.0)

1.5 (1.3–1.7)

 40 h/weekly

1079

999

92.6%

2.0 (1.9–2.2)

1.1 (1.0–1.2)

0.002

  < 40 h/weekly

299

249

83.3%

2.6 (2.2–3.0)

1.5 (1.1–1.9)

 FSH

1222

1117

91.4%

2.1 (1.9–2.2)

1.2 (1.0–1.3)

0.019

 TBCU

156

131

84.0%

2.7 (2.1–3.2)

1.5 (1.0–1.9)

  ≤ 1.052 BGI

684

612

89.4%

1.5 (1.4–1.7)

0.8 (0.7–0.9)

< 0.001

  > 1.052 BGI

698

632

90.5%

2.6 (2.3–2.8)

1.5 (1.4–1.7)

  ≤ 2 years

743

669

90.0%

1.7 (1.5–1.8)

1.0 (0.8–1.1)

< 0.001

  > 2 years

635

579

91.2%

2.6 (2.4–2.9)

1.5 (1.3–1.7)

 São Paulo

1077

983

91.3%

2.1 (2.0–2.3)

1.2 (1.1–1.3)

0.975

 Others

301

265

88.0%

2.1 (1.8–2.4)

1.1 (0.9–1.3)

 Public

336

310

92.3%

2.1 (1.8–2.4)

1.0 (0.8–1.2)

0.852

 Private

858

785

91.5%

2.0 (1.8–2.2)

1.1 (1.0–1.2)

 São Paulo

195

171

87.7%

1.9 (1.6–2.1)

1.3 (1–1.5)

0.990

 Other locals

999

924

92.5%

2.0 (1.9–2.2)

1.1 (1–1.2)

 Non specialist

1232

1113

90.3%

2.1 (2.0–2.3)

1.1 (1.0–1.2)

0.199

 Specialist

146

135

92.5%

2.3 (1.9–2.7)

1.5 (1.2–1.9)

 No

1099

1099

100.0%

1.9 (1.8–2.0)

1.1 (1.0–1.2)

< 0.001

 Yes

149

149

100.0%

0.8 (0.7–1.0)

0.7 (0.6–0.7)

 General

1371

1242

90.6%

2.1 (2.0–2.3)

1.2 (1.1–1.3)