condition mean min max ZT0-3 1.72261 1.72261 1.72261 ZT4-7 2.12501 2.12501 2.12501 ZT8-11 1.4369049999999999 1.4369049999999999 1.4369049999999999 ZT12-15 1.79426 1.79426 1.79426 ZT16-19 2.67746 2.67746 2.67746 ZT20-23 4.023703333333334 4.023703333333334 4.023703333333334