condition mean min max ZT0-3 10.608079 10.608079 10.608079 ZT4-7 11.002699 11.002699 11.002699 ZT8-11 11.1443405 11.1443405 11.1443405 ZT12-15 10.16261 10.16261 10.16261 ZT16-19 10.836043 10.836043 10.836043 ZT20-23 10.758563500000001 10.758563500000001 10.758563500000001