condition mean min max ZT0-3 33.649262585 30.84487685 36.45364832 ZT4-7 23.63593716 18.78199657 28.48987775 ZT8-11 25.3919201525 24.733521380000003 26.050318925 ZT12-15 7.0072969445 3.449010357 10.565583532 ZT16-19 5.7599130359999995 4.088742809499999 7.4310832625 ZT20-23 22.21797069 11.711204989999999 32.724736390000004