condition mean min max ZT0-3 3.4333816666666666 2.5317499999999997 4.461985 ZT4-7 3.57476 3.57476 3.57476 ZT8-11 5.104845 5.104845 5.104845 ZT12-15 5.77456 5.55084 5.99828 ZT16-19 3.81102 3.81102 3.81102 ZT20-23 3.158865 3.158865 3.158865