condition mean min max ZT0-3 299.616672 299.616672 299.616672 ZT4-7 396.2377295 396.2377295 396.2377295 ZT8-11 486.61154 486.61154 486.61154 ZT12-15 424.867665 424.867665 424.867665 ZT16-19 409.2956305 409.2956305 409.2956305 ZT20-23 298.697766 298.697766 298.697766