condition mean min max ZT0-3 2.8407660454999997 1.7762542959999998 3.905277795 ZT4-7 2.1942868475 1.9862205205 2.4023531745 ZT8-11 2.27548743 2.214092422 2.336882438 ZT12-15 1.3820364225000001 1.3715834585 1.3924893865 ZT16-19 1.6178010087499999 1.397588586 1.8380134315 ZT20-23 2.57125096525 2.4857202935 2.656781637