condition mean min max ZT0-3 98.962428 98.962428 98.962428 ZT4-7 110.647279 110.647279 110.647279 ZT8-11 129.151992 129.151992 129.151992 ZT12-15 117.9813755 117.9813755 117.9813755 ZT16-19 261.3136845 261.3136845 261.3136845 ZT20-23 179.899668 179.899668 179.899668