condition mean min max ZT0-3 4372.6 4372.6 4372.6 ZT4-7 5138.4 5138.4 5138.4 ZT8-11 4940.55 4940.55 4940.55 ZT12-15 3851.5 3851.5 3851.5 ZT16-19 3295.1499999999996 3295.1499999999996 3295.1499999999996 ZT20-23 3955.3 3955.3 3955.3