condition mean min max ZT0-3 81.935404 81.935404 81.935404 ZT4-7 73.11278 73.11278 73.11278 ZT8-11 75.64858799999999 75.64858799999999 75.64858799999999 ZT12-15 91.2651905 91.2651905 91.2651905 ZT16-19 86.2225385 86.2225385 86.2225385 ZT20-23 100.757204 100.757204 100.757204