condition mean min max ZT0-3 29.065590727500002 28.201394225 29.92978723 ZT4-7 34.8160640825 30.34404451 39.288083655 ZT8-11 66.1623297425 54.64211515 77.682544335 ZT12-15 46.050909375 34.36257825 57.7392405 ZT16-19 30.83327375 28.415637185 33.250910315 ZT20-23 28.056312452500002 26.549282085 29.563342820000003