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Table 3 Methodological items for nonrandomized studies

From: Clinical efficacy and safety of posterior minimally invasive surgery in cervical spondylosis: a systematic review

Study

A clearly stated aim

Inclusion of consecutive patients

Prospective collection of data

Endpoints appropriate to the aim of the study

Unbiased assessment of the study endpoint

Follow-up period appropriate to the aim of the study

Loss to follow-up less than 5%

Prospective calculation of the study size

Yu [16]

2

2

2

2

0

1

2

0

Qiu [17]

2

2

2

2

0

1

2

0

Luo [18]

2

2

2

2

0

2

2

0

Haijun [19]

2

2

2

2

0

2

2

0

Oshima [20]

2

2

2

2

0

2

2

0

Liu [13]

2

2

2

2

0

1

2

0

Zhang [21]

2

2

2

2

0

1

2

0

Ross [22]

2

2

1

2

0

2

2

2

Zhang [23]

2

2

2

2

0

2

2

0

Siemionow [24]

2

2

2

2

0

2

1

0

Yadav [25]

2

2

2

2

0

2

2

0

Dahdaleh [14]

2

2

2

2

0

2

2

0

Yabuki [26]

2

2

2

2

0

1

2

0

Adamson [32]

2

2

0

0

0

2

2

0

  1. The items are scored 0 (not reported), 1 (reported but inadequate) or 2 (reported and adequate)