condition mean min max ZT0-3 476.25 476.25 476.25 ZT4-7 429.1 429.1 429.1 ZT8-11 391.79999999999995 391.79999999999995 391.79999999999995 ZT12-15 489.05 489.05 489.05 ZT16-19 621.9000000000001 621.9000000000001 621.9000000000001 ZT20-23 507.55 507.55 507.55