condition mean min max ZT0-3 8.206278333333334 0.0 15.23163 ZT4-7 20.69305 20.69305 20.69305 ZT8-11 3.066435 3.066435 3.066435 ZT12-15 3.3564499999999997 3.323555 3.389345 ZT16-19 2.85382 2.85382 2.85382 ZT20-23 16.3414 16.3414 16.3414