Parsing a nested array where key is a float in php

I have the following query that I need to get a value from a nested array. I'm using laravel 5.4 in case that matters.

$usersstyle = DB::connection('mysql2')
  ->table('wp_rg_lead_detail')
  ->where('lead_id', $collection->id)
  ->get();
dd($usersstyle);

This has an output of:

Collection {#396 ▼
#items: array:49 [▼
0 => {#406 ▶}
1 => {#407 ▶
18 => {#428 ▼
  +"id": 655
  +"lead_id": 67
  +"form_id": 8
  +"field_number": 51.0
  +"value": "Yes"
}
19 => {#429 ▼
  +"id": 656
  +"lead_id": 67
  +"form_id": 8
  +"field_number": 6.1
  +"value": "Sleeveless"
}
20 => {#430 ▼
  +"id": 657
  +"lead_id": 67
  +"form_id": 8
  +"field_number": 6.2
  +"value": "Jacket"
}
21 => {#431 ▼
  +"id": 658
  +"lead_id": 67
  +"form_id": 8
  +"field_number": 6.3
  +"value": "Cardigan"
}
22 => {#432 ▶}

I have tried the following, but it returns the 1st instance of the field_number, and ignores the 6.2 and 6.3. How do I do this and keep all the floats as keys.

 $keyed = $usersstyle->keyBy('field_number')->all();

I want to get something like the below. With out a foreach loop to display that.

 echo $6.3->value;

with the result being Cardigan

I have also used

  $grabvalues = $usersstyle->whereIn('field_number', 80.3)->toArray();

this returns an array or if i drop the toArray a collection that I still need to loop through to get the value

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