condition mean min max ZT0-3 10.858283 10.858283 10.858283 ZT4-7 11.287949000000001 11.287949000000001 11.287949000000001 ZT8-11 11.855148 11.855148 11.855148 ZT12-15 10.2635845 10.2635845 10.2635845 ZT16-19 10.990962 10.990962 10.990962 ZT20-23 12.961458 12.961458 12.961458