condition mean min max ZT0-3 2.8625975534999997 2.8169646769999996 2.90823043 ZT4-7 2.50213375925 2.0750809795 2.929186539 ZT8-11 3.71151492625 3.0701843095 4.352845543 ZT12-15 3.7779723484999996 3.2863932285 4.2695514685 ZT16-19 3.4657320289999998 2.9780282915000003 3.9534357664999997 ZT20-23 5.140348092249999 4.955683672499999 5.325012512