condition mean min max ZT0-3 1.73295 1.73295 1.73295 ZT4-7 1.24558 1.24558 1.24558 ZT8-11 1.37361 1.37361 1.37361 ZT12-15 0.9904265 0.9904265 0.9904265 ZT16-19 1.3841455 1.3841455 1.3841455 ZT20-23 1.4299499999999998 1.4299499999999998 1.4299499999999998