condition mean min max ZT0-3 497.616672 497.616672 497.616672 ZT4-7 2520.925086 2520.925086 2520.925086 ZT8-11 1715.9251195000002 1715.9251195000002 1715.9251195000002 ZT12-15 477.495047 477.495047 477.495047 ZT16-19 337.278246 337.278246 337.278246 ZT20-23 229.91026749999997 229.91026749999997 229.91026749999997