condition mean min max ZT0-3 5.04036 5.04036 5.04036 ZT4-7 4.53885 4.53885 4.53885 ZT8-11 3.7332 3.7332 3.7332 ZT12-15 4.13053 4.13053 4.13053 ZT16-19 5.57428 5.57428 5.57428 ZT20-23 5.4411 5.4411 5.4411