condition mean min max ZT0-3 10.196226 10.196226 10.196226 ZT4-7 9.9559565 9.9559565 9.9559565 ZT8-11 9.877172999999999 9.877172999999999 9.877172999999999 ZT12-15 9.3237805 9.3237805 9.3237805 ZT16-19 9.8580045 9.8580045 9.8580045 ZT20-23 9.6891085 9.6891085 9.6891085