120 Office Chairs

Out of 120 office chairs, 15 are clearly qualified, while the number of qualified ordinary staff chairs is unknown, and the overall pass rate may be below 12.5%.

According to the evaluation criteria, a qualified office chair must meet five adjustable functions: seat height adjustment, lumbar support, seat depth adjustment, armrest height, and backrest damping. The 120 office chairs evaluated in this assessment are divided into three categories, with specific qualification details as follows:

Executive Chairs (Herman Miller Aeron): There are 8 chairs in total, all meeting the five adjustable function standards, with a pass rate of 100%. This brand is renowned for its ergonomic design, and its products generally adhere strictly to international standards. For example, the seat height adjustment range can accommodate users of different heights; the lumbar support employs dynamic fitting technology, automatically adjusting the support intensity with changes in sitting posture to ensure the natural curvature of the lumbar spine; seat depth adjustment is achieved through a slide rail design for precise positioning, avoiding pressure on the front of the thighs; armrest height can be independently adjusted to match different desk heights; and backrest damping is infinitely adjustable through a gas spring, meeting different needs for rest and work.

Middle-Management Chairs (Sihoo M57): There are 15 chairs in total, with 7 meeting the standards, resulting in a pass rate of 47%. The 8 chairs that did not meet the standards may have issues such as missing some functions or insufficient adjustment ranges. For example, some chairs may only support seat height and armrest height adjustments, but have fixed lumbar support that cannot adapt to the lumbar curvature of users with different body types; or the seat depth adjustment range may be limited, causing the front of the thighs of tall users to hang in the air, affecting blood circulation; backrest damping adjustment may lack precise control, resulting in excessive or insufficient resistance during reclining, affecting comfort.

Ordinary Staff Chairs (Hebao/NetEase Yanxuan): There are 82 chairs in total, and the article does not provide specific numbers or proportions of qualified chairs. If we refer to the overall conclusion that 'nearly half have hidden defects,' it can be inferred that the pass rate of this category of chairs may be lower than that of middle-management chairs. Hidden defects may include adjustable functions that are virtually useless (such as excessively small adjustment ranges or jerky operation), insufficient material durability (such as short lifespan of gas springs or loose mesh fabric), or designs that do not conform to ergonomic principles (such as misaligned lumbar support positions or armrests that cannot support the elbows), which may lead to lumbar muscle strain and cervical fatigue with long-term use.

In summary, out of the 120 chairs, 15 are clearly qualified (8 executive chairs + 7 middle-management chairs), the number of qualified ordinary staff chairs is unknown, and the overall pass rate may be below 12.5% (15/120).