condition mean min max ZT0-3 143.466666 143.466666 143.466666 ZT4-7 123.5026325 123.5026325 123.5026325 ZT8-11 124.998954 124.998954 124.998954 ZT12-15 142.620492 142.620492 142.620492 ZT16-19 170.4628465 170.4628465 170.4628465 ZT20-23 161.39051 161.39051 161.39051