condition mean min max ZT0-3 135.731098 135.731098 135.731098 ZT4-7 161.225436 161.225436 161.225436 ZT8-11 159.89155849999997 159.89155849999997 159.89155849999997 ZT12-15 152.2585145 152.2585145 152.2585145 ZT16-19 183.49436550000001 183.49436550000001 183.49436550000001 ZT20-23 233.54348800000002 233.54348800000002 233.54348800000002