condition mean min max ZT0-3 2.00590506025 1.5180348405 2.49377528 ZT4-7 1.2253530007500002 1.0617364345 1.3889695670000002 ZT8-11 1.88699023475 1.4643239255 2.309656544 ZT12-15 3.0185044257499998 2.3915831725 3.6454256789999997 ZT16-19 6.271417942499999 4.6086127784999995 7.934223106499999 ZT20-23 11.50263996275 9.3961660205 13.609113905