condition mean min max ZT0-3 1.5819343775 1.125074065 2.03879469 ZT4-7 3.5144306067499995 3.1376405619999996 3.8912206515 ZT8-11 6.38208130075 3.7539166930000003 9.0102459085 ZT12-15 7.243654626750001 6.416288472500001 8.071020781000001 ZT16-19 5.1357613125 4.27627516 5.995247465 ZT20-23 1.783311901 1.3186081375 2.2480156645